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General Information
TitleThe Serpent's Embrace
Real NameCassiopeia du Couteau
Release DateDecember 14th, 2010
Cost4800 BE 880 RP

630 (+ 104)

5.5 (+ 0.5)

350 (+ 60)

8 (+ 0.8)


53 (+ 3)

0.647 (+ 1.5%)


18 (+ 4.7)

32 (+ 1.3)
Developer Info
DDragon KeyCassiopeia
Integer Key69
External Links
Game Info Wikileagueoflegends.fandom.com

Cassiopeia is a champion in League of Legends.


For outdated and now non-canon lore entries, click here.
  • Biography
  • Story
Cassiopeia is a deadly creature bent on manipulating others to her will. Youngest and most beautiful daughter of the noble Du Couteau family of Noxus, she ventured deep into the crypts beneath Shurima in search of ancient power. There, she was bitten by a gruesome tomb guardian, whose venom transformed her into a viper-like predator. Cunning and agile, Cassiopeia now slithers under the veil of night, petrifying her enemies with her baleful gaze.

The youngest child of General Du Couteau, Cassiopeia was born to a life of possibility and privilege among the Noxian noble houses. From an early age, she displayed a keen mind and sharp wit, and while her sister Katarina flourished under their father’s tutelage, it was their mother Soreana in whose footsteps Cassiopeia would follow.

A hero of Noxus’ expansion into Shurima, General Du Couteau eventually sent for his family, installing them close to the governor of the coastal city of Urzeris. Surrounded by strangers in an unfamiliar land, Cassiopeia remained close to her mother, learning much of politics, diplomacy, and subtle influence. As she grew, Cassiopeia could not help but glimpse other, hidden concerns within Soreana, beyond those of the empire…

One day, quite unexpectedly, Soreana collapsed in the family residence—her hairbrush had been laced with caustic venoms by an unknown hand, leaving her close to death. General du Couteau was well versed in the ways of an assassin, and so he had all the household staff removed, leaving his wife and daughters alone in an empty house.

Still little more than a child, Cassiopeia never left her mother’s bedside. While Soreana’s recovery took many months, the bond between them became stronger than ever before.

When the general was recalled to Noxus to prepare for the long-awaited invasion of Ionia, he took Katarina with him, but Cassiopeia remained in Urzeris. Seemingly relieved, Soreana confided in her daughter that she belonged to a clandestine and secretive cabal, known by some as “the Black Rose”. Having guided the empire for centuries, they had finally managed to spread their influence into Shurima.

Now free of her husband’s watchful eye, Soreana’s real work could begin.

In time, and under her mother’s tutelage, Cassiopeia blossomed into a young woman of tremendous beauty, cunning and intelligence, if somewhat lacking in empathy. She saw those around her as tools to be used to achieve her goals, and then cast aside just as quickly.

Though she had barely reached the cusp of womanhood, she was initiated into the Black Rose by hunting down and eliminating those who had sought the death of her mother. She surprised even Soreana with her speed and efficiency, and left no trace of her activities—or her proxies—behind. Only then was Cassiopeia made privy to the cabal’s broader plan for Shurima. Using her family’s tremendous resources, she undertook a number of expeditions into the deep desert, raiding ancient ruins with the help of a local mercenary named Sivir.

Her efforts were made all the more urgent when word reached Urzeris from the capital. Grand General Boram Darkwill had been deposed by Jericho Swain, and a number of noble houses had chosen to honor this coup… including Du Couteau.

Outraged and disgusted by her husband’s betrayal, and fearing that all members of the Black Rose were now in jeopardy, Soreana became desperate. She dispatched Cassiopeia to seek out the godlike power that had been the key to Shurima’s supremacy in ages past. Cassiopeia swore she would return with a weapon ready for the looming secret war, or not at all.

Fulfilling this oath would leave her changed forever. Upon unearthing a long lost tomb of the mythical Ascended, she knew this was the threshold to the power she sought, and intended to dispatch all witnesses from her expedition before claiming it. The guide Sivir was the first to fall to Cassiopeia’s blade, but then an ancient stone tomb guardian reared up, and buried its fangs into her flesh.

Overcome by its arcane toxins, she was carried back through the desert by her hired soldiers, screaming as her body twisted into something new and unspeakable…

Cassiopeia locked herself in the disused crypt of the Urzeris residence, and endured the untold agonies of this transformation. Gone was the brilliant and beautiful daughter of Soreana Du Couteau, replaced by a monstrous, slithering creature that skulked in the shadows, spitting poison, and crushing stone as easily as glass.

For weeks she wept and howled, grieving her lost life… until the day she could weep no more. She dragged herself up from the depths of despair, determined to accept—maybe even someday embrace?—her fate. It was not the Ascension she had hoped for, but Cassiopeia had unearthed the magic of dead Shuriman gods. She would turn it to the schemes of the Black Rose just as she and her mother had planned, and she could feel this power growing within her, day by day.

Though into what, even she cannot guess.

"Secrets are sharper than blades…"

- CassiopeiaSquare.pngCassiopeia


Cassiopeia reclined against the crenelated rooftop, and gazed over the winding alleys and crowded streets of Urzeris. A Noxian possession for years, the coastal city still refused to completely embrace its new identity—it felt ancient, and quietly resistant to the future.

So Shuriman.

Untroubled by the cool night air, Cassiopeia wore a shift of translucent silk, which revealed the transition at her hips where soft skin merged into sinuous, overlapping snake scales. The scent of roasted meat wafted up to her hidden aerie, but it could not mask the vile stench of thousands of people living on top of each other. Her mouth burned as noxious venom mingled with her saliva. She flexed her muscular tail, cracking the stonework and sending crumbled fragments to the streets below.

Rats scattered from the falling stone. Filthy street urchins dashed around street corners as hooded figures whispered in the shadows and burly soldiers staggered in and out of taverns. All were oblivious to the predator lurking in the darkness above.

Cassiopeia brushed a taloned hand against her scaly side, her serpentine figure concealed by the shadows. Once, she had been a powerful figure in Noxus: assassins killed at her slightest whim, soldiers spilled their darkest secrets, and generals willingly followed her counsel in the hopes of patronage. Cassiopeia sighed. These days, she emerged only under cover of night. No longer was she an influential voice in Noxian society—not since she had been reduced to this grotesque abomination in hiding.

Upon her return from the desert, Cassiopeia had hidden in the crypt of her family’s residence, fearful of her transformation. She remained alone in the cold, dank vault for weeks, filled with disgust for her serpentine body and mourning the loss of her aristocratic life.

Eventually, a growing desire to hunt overwhelmed her, and she ventured out to roam the city by night as the household slumbered.

Cassiopeia put aside her reverie as a broad-shouldered soldier in a leather breastplate stumbled from a tavern, drink in hand. Finally; this was the man she’d been waiting for. She trailed his movements from above, following him silently over fortress walls and archways, until he entered an empty courtyard. Perfect. Cassiopeia slithered onto an adjacent roof, eyes glinting with predatory thrill.

Her figure cast a shadow across the soldier. He turned, drunkenly defiant.

“I know you’re there! Show yourself!” he said.

Cassiopeia’s tail twitched in anticipation. Her forked tongue extended, tasting the air. She drew the sweet scent of his blood into her lungs, then exhaled with great satisfaction.

“Fight me face to face!” he shouted. “I ain’t gonna be stalked like some animal.”

Cassiopeia let out an angry hiss. By the time the soldier looked up, she’d slid to the opposite side of the courtyard and perched directly above him, remaining out of sight in the shadows.

“You consider yourself better than an animal, do you?” she said.

The man’s head turned abruptly, trying to pinpoint the sound of her voice.

“How’d you get across so fast?” he said, his wavering tone betraying false bravado.

“Even beasts are nothing to your savagery,” said Cassiopeia.

Breathless, he edged away, looking for an escape. He hammered his fists against every door, but each was bolted shut. Cassiopeia imagined his mind racing to solve the riddle of who was hunting him and why.

He unsheathed his sword, turning on the spot, unsure where to direct his threat. “You don’t want to cross me. I’ve gutted worse enemies than you.”

“Not just enemies,” Cassiopeia replied. “I’ve seen your handiwork. You’re not the only one who creeps about in the dark.”

She spat a bilious wad of venom as he turned toward the sound of her voice. The man howled in pain, coin-sized holes burning through his armor and into his skin. She inhaled the satisfying sear of burning leather and flesh.

The man brandished his sword. “Who are you? Why’re you doing this?”

“I’ve been watching you,” replied Cassiopeia. “I know what you are, what you do…”

“What I do is no business of yours.”

“I know you’re murdering children for drake meat. I hear it’s quite lucrative.”

The man tried to pry open the shutters of a nearby window with the flat of his sword, but they too were bolted shut.

“Then there’s the three tavern wenches,” said Cassiopeia. “Sarmela, Elmin, and Lyx. They were found in the river yesterday. Their faces were hardly recognizable once you’d finished with them.”

She relished the thought of sinking her talons into his flesh.

The man readied his stance. “You can’t fight me from the shadows. Show yourself!”

“Very well,” Cassiopeia said.

She slithered down to the courtyard and rose to her full height. The man’s eyes widened in horror, his hands trembling. Cassiopeia stood head and shoulders over the man, glaring down with narrowing eyes.

“Monster!” he cried.

“Monster,” murmured Cassiopeia. “Not the worst I’ve been called.”

She slid left and whipped her tail across his legs, effortlessly knocking him to the ground.

Curling her tail around his chest, she squeezed his ribcage tighter and tighter, sensing his pounding heart straining beneath her grasp. She heard bones crack. She resisted the urge to break him completely, and released her grip. He crawled to his sword, grasping it in desperation. She so enjoyed watching him tremble.

She circled him slowly. He met her gaze and stared in slow recognition.

“I know your face. The Lady Cassiopeia!” he said. “Look at you!”

Point to the ground, he pushed himself onto his feet with his sword.

“You chase drunkards like me through the filthy gutters of this city now, is that it?” The man spat a wad of blood. “From such great heights we fall, eh?”

She hissed, exposing dripping yellow fangs.

Cassiopeia’s gaze bored into the man’s eyes, locking them in a cold-hearted bond. She screamed, pouring all her rage into the cry; fury at the unfairness of her current state, anger at the loss of her privileged life, resentment for her failed ambitions. She channeled it all into the screeching, mind-shredding wail.

As she screamed, her fury was replaced with joy. It felt like she was floating, her potential for greatness infinite. Every fiber of her being sang with ancient power.

Searing emerald light blazed from Cassiopeia’s eyes. The man’s final panic was outlined in silhouette as he petrified from the inside out. His stare hardened, greyed, and stiffened, his last cry of terror stifled as her curse transformed his flesh to stone.

Cassiopeia slithered up to the statue and softly caressed its hard cheek. What was once skin fractured into a grisly pattern resembling a dried riverbed.

“Once, I had to manipulate, bribe, or otherwise… persuade people to orchestrate my schemes,” she said. “But now… Now I simply take what I want.”

She whipped her tail forward, smashing the statue to the ground. She smiled, eyes glinting, as it shattered into a thousand pieces of rubble and dust.

Cassiopeia flushed with pride as she considered her handiwork. Her life as a noble was over, yes, but never had she felt such boundless power coursing through her veins. She slithered back onto the rooftops, her mind awhirl with ideas.

Her next victim would offer her a far greater challenge.


Serpentine Grace.png Serpentine Grace [Passive]

Innate: Cassiopeia gains Movement Speed per level. Cassiopeia cannot purchase Boots items.
Movement Speed: 332 - 400 (based on level)
Noxious Blast.png Noxious Blast [Q]
Cost: 50 / 55 / 60 / 65 / 70 Mana Cooldown: 3.5 seconds Range: 850 Area of Effect: 75

Active: Blasts enemies in an area with Noxious Poison. If a champion is hit, Cassiopeia gains Movement Speed decaying over 3 seconds.

Noxious Poison deals magic damage over 3 seconds.

Movement Speed: 30 / 35 / 40 / 45 / 50%
Magic Damage: 75 / 110 / 145 / 180 / 215 (+90%)
Miasma.png Miasma [W]
Cost: 70 / 80 / 90 / 100 / 110 Mana Cooldown: 24 / 22 / 20 / 18 / 16 Range: 700 Area of Effect: 160

Active: Cassiopeia spews venom in an arc, leaving toxic clouds for 5 seconds.

Enemies in the clouds are continually afflicted with Debilitating Poison, inflicting a decaying slow and grounding them, prohibiting the use of Movement abilities. They also take magic damage per second.

Miasma has a minimum cast range and stops on the first terrain hit.

Magic Damage: 20 / 25 / 30 / 35 / 40 (+15%)
Slow: 40 / 50 / 60 / 70 / 80%
Twin Fang.png Twin Fang [E]
Cost: 50 / 48 / 46 / 44 / 42 Mana Cooldown: 0.75 seconds Range: 700

Active: Deal magic damage to a target. If the target is killed by Twin Fang, or is killed during its flight, Cassiopeia gains Mana.

If the victim is Poisoned when Twin Fang hits, it takes additional magic damage and heals Cassiopeia (75% heal against Minions and small Monsters).

Magic Damage: 52 - 120 (based on level) (+10%)
Poisoned Bonus Damage: 20 / 40 / 60 / 80 / 100 (+60%)
Heal: (+10 / 11.5 / 13 / 14.5 / 16%)
Petrifying Gaze.png Petrifying Gaze [R]
Cost: 100 Mana Cooldown: 120 / 100 / 80 seconds Area of Effect: 850

Active: Cassiopeia deals magic damage to all enemies in a cone in front of her. Enemies facing her when damaged are stunned for 2 seconds, while enemies facing away are slowed by 40%. Magic Damage: 150 / 250 / 350 (+50%)

Patch History[]

Patch 11.8

E cost now scales down.

Cass has been coiled up tight with Tear of the Goddess, as she relies on its mana in mid and late game teamfights. This dependence has caused her to suffer both in power and freedom in item diversity, so we’re scaling down her need for it.

Twin Fang.png E - Twin Fang

COST : [50 mana] 50/48/46/44/42 mana

Patch 10.23
 Champion Mana Adjustments

Between mana changes to items like Tear, Sheen, Lich Bane, and the lack of mana on most Mythic items, we're giving the following champions a +20 increase to mana growth:

  • CassiopeiaSquare.pngCassiopeia

Patch 10.13
Base magic resist decreased.

Our snaky lady didn't lose quite as much as we'd have liked last patch, so we're walking (slithering?) back some changes. Bundled with the Conqueror changes, we’re hoping this follow-up will help Cass shed her skin.

Base Stats

MAGIC RESIST : [34] 32

Patch 10.12
Base health and armor decreased; magic resist increased.

This serpent has been embracing both top and bot with open arms, and we’re primarily aiming for these changes to scale back her prowess in those lanes. With that being said, we’re softening the nerf to mid lane Cass by subtly bumping up her magic resist defenses.

Base Stats

HEALTH : [575] 560
ARMOR : [20] 18
MAGIC RESIST : [30] 34

Patch 10.11

We're trying some smaller scope changes to champions whose ability VFX are generally fine, but could use some more clarity when it comes to their hitboxes. In Cassiopeia's case, it was difficult for both those playing her and her enemies to see the smoke particles on her Q and know the exact size of her ultimate. Both of these have been updated for more accuracy. Additionally, it was sometimes hard for Cassiopeia players to know which targets were Poisoned (and in turn, receive bonus damage from her E). So now, Cassiopeia will see a clearer indicator above her Poisoned targets' head.

NOXIOUS BLAST : Updated the smoke particles on her base skin to more accurately stay within the actual range of the ability
TWIN FANG : Enemy champions that are Poisoned will have a fang icon over their head to indicate that they will receive bonus damage from it
PETRIFYING GAZE : Updated on all skins with a decal at the edge of her hitbox, more clearly showing the area affected

Patch 9.14

MIASMA COOLDOWN : [24/21/18/15/12]
TWIN FANG HEALING : [13/16/19/22/25%]

W minimum cast range removed; maximum cast range decreased; cooldown increased early and decreased late. E healing increased; now reduced when poisoning minions and small monsters; cost flattened. Ability casts now buffer.

Outside of the flexibility in mobility, Cassio is getting too much out of just a few (or one!) points in her E, so we're amping up the value at later ranks to encourage a full rank-up.


BUFFERING Cassiopeia can now buffer her ability casts

Base Stats

HEALTH : [537] 575
MANA : [418] 350
MANA GROWTH : [31.5] 40
ARMOR : [25] 20

Miasma.png W - Miasma

MINIMUM CAST RANGE Cassiopeia no longer has a minimum cast range on Miasma
COOLDOWN : [18/17.5/17/16.5/16]

Twin Fang.png E - Twin Fang

BASICALLY RAT POISON Cassiopeia heals for 75% less when she poisons minions and small monsters
HEAL : [5-22 (based on level) (+0.1 AP)]
13/16/19/22/25% of her ability power
COST : [40/45/50/55/60]
50 all ranks

Patch 9.8
E cost decreased at later ranks.

With the recent increases to her Q and W mana costs, we find that Cassio is having trouble staying afloat in lane and in mid-game skirmishes. Since E-max on Cassio makes for a great and aggressive playstyle anyways, we're killing two birds with one stone, helping her stay in those situations longer and keeping her kill potential high.

Twin Fang.png E - Twin Fang

COST : [40/50/60/70/80]
40/45/50/55/60 mana

Patch 9.3
Q base damage decreased late; ratio increased. W damage reduced late, cost increased late.

Next verse, same as the first (well, we've actually been here twice in recent history) . Cassiopeia is still too strong when fighting from extremely safe distances.

Noxious Blast.png Q - Noxious Blast

BASE DAMAGE : [75/120/165/210/255]
RATIO : [0.8] 0.9 ability power

Miasma.png W - Miasma

COST : [70] 70/80/90/100/110 mana
DAMAGE PER SECOND : [20/30/40/50/60]
MAX DAMAGE : [100/150/200/250/300]

Patch 9.2
W cooldown increased late; damage decreased late.

As a followup to the Noxious Blast nerf at the end of last year, we're reducing Miasma's effectiveness so Cassiopeia has to rely more on Twin Fang for damage. This forces her to get close to enemies, offering them an opportunity to fight back rather than melting helplessly from a distance.

Miasma.png W - Miasma

COOLDOWN : [18/17/16/15/14]
18/17.5/17/16.5/16 seconds
DAMAGE PER SECOND : [20/35/50/65/80]
MAX DAMAGE : [100/175/250/325/400]

Q base damage increased late. Q damage ratio increased.

Noxious Blast.png Q - Noxious Blast

BASE DAMAGE : [75/120/165/210/255]
DAMAGE RATIO : [0.7] 0.8 ability power


25 mages have more mana regen and base mana, but less mana growth. 5 other mages have more mana regen.

We’re increasing mana regen on the champions most affected by the changes to Doran's Ring and Last Chapter. Mages are also getting some changes to their mana pools and their mana growth. Overall, they’ll be up a bit of starting mana and mana regen, but be substantially down on mana per level.


Noxious Blast.png Q - Noxious Blast

COST : [60/65/70/75/80]
50/55/60/65/70 mana

Twin Fang.png E - Twin Fang

BONUS DAMAGE VS POISONED TARGETS : 10/30/50/70/90 [(+0.5 AP)]
(+0.6 AP)  


BASE HEALTH : [525] 537

E bonus against poisoned targets shifted from base damage into ratio.

Twin Fang’s high base damage is allowing Cassiopeia to dip into defensive itemization while still pumping out glass-cannon-level damage in the early-to-mid game. If Cass wants to melt face, she should have to (literally) pay for it.

Twin Fang.png E - Twin Fang

BONUS RATIO VS POISONED TARGETS : [0.4] 0.5 ability power

Mana per level increased. E base damage down, AP ratio increased.

Cassiopeia is known and picked for her ability to control her lane very well during early levels. We’re okay with her having some early kill pressure, but opting into the level 1 non-empowered “E-spam” strategy shouldn’t automatically win the lane.

Base stats

BASE MANA : [375] 334

Twin Fang.png E - Twin Fang

DAMAGE VS POISONED TARGETS : [10/40/70/100/130 (+0.35 AP)]
15/40/65/90/115 (+0.4 AP)


For real thissssssssss time.


NO HOVER SNAKES : Cassiopeia’s tail now follows her realistically as she moves and turns


With Aegis of the Legion's old aura out of the game, squishy champions who were relying on it to give them enough magic resist find themselves a bit on the burstable side.

HOORAY : Champions who previously gained no magic resist per level now gain 0.5 per level

Cassiopeia is now slick. Fixed a Flash + Ult bug.


NO HOVER SNAKES : Cassiopeia’s tail now follows her realistically as she moves and turns


DIZZY SNAKE : Flashing during R - Petrifying Gaze’s cast time no longer resets the direction the cone fires in. It now consistently fires in the direction Cassiopeia faced before Flashing. This addresses a bug that sometimes caused Petrifying Gaze’s visuals to not line up with the actual effect.

W cast range reduced. E healing down.

We’ve had this conversation a few times since mid-season, but to restate one of our beliefs: late-game characters like Cassiopeia need to have windows of interaction in the early game so opponents have a fair chance of winning. As Cass players learned to play around their bootless immobility, those windows have gradually closed. With finer mastery over their combat ranges, Cassiopeia players are now controlling too much of the battlefield from too far a distance, all the while sustaining through the damage opponents do manage to land. We’re heightening the risks Cassiopeia needs to take in lane to re-open those windows of interaction necessary to justify her late-game hyperscaling.

Serpentine Grace.png Passive - Serpentine Grace

AN UNNECESSARY PATCH NOTE : Cassiopeia still can’t wear boots. We thought you’d like to know.

Miasma.png W - Miasma

CAST RANGE : [900] 800

Twin Fang.png E - Twin Fang

HEALING ON POISONED TARGETS : [5/10/15/20/25] 5-22 (at levels 1-18)

Q and W ranges up. W cooldown decreased.

One of the larger Midseason mage updates, Cassiopeia’s strengths as an immobilizing controller have been muted by a rather weak release state. Low ranges across her poisons appear to be the culprit, as Cassi quite literally lives or dies on her ability to access Noxious Blast’s burst of speed (or Miasma’s grounding). Add in some bonus usability to her poisons and Cassiopeia will see herself actually able to play her keep-away kite game without being overrun.

Noxious Blast.png Q - Noxious Blast

RANGE : [750] 850
SAVOR THE MOMENT : Noxious Blast’s movement speed bonus takes longer to decay
POISONOUS CLARITY : “Poisoned” particle’s size has been increased

Miasma.png W - Miasma

COOLDOWN : [22/20/18/16/14 seconds] 18/17/16/15/14 seconds
MINIMUM RANGE : [550] 500
MAXIMUM RANGE : [800] 900
BRINGING IT BACK : No longer stops upon hitting terrain

5/9/2016 Balance Update

Cassiopeia's update shaved a little too much power off of Twin Fang. Rather than raw damage buffs, we're giving back a bit of its uptime.

Twin Fang.png E - Twin Fang

Cooldown : [0.9 seconds] 0.75 seconds
COST : [60/65/70/75/80 mana] 40/45/50/55/60 mana
RANGE : [550 (from Cassiopeia's hitbox edge to her opponent's)] 700 (from Cassiopeia's hitbox center to her opponent's.) Overall, slight increase against small targets and slight decrease against large targets.


True to her half-snake nature, Cassiopeia bears twin identities of “poison mage” and “lightning-fast viper strikes.” However, the high-input gameplay of Twin Fang has left Cassiopeia wanting for greater impact in her poisons, instead viewing them as a gating condition for her combo damage.

Rather than giving her more damaging poisons (Singed has that market cornered), we’ve sharpened Cassiopeia’s poison fantasy by linking Miasma to another snake fantasy: immobilization. The new Miasma lets Cassiopeia weaponize her own immobility by bringing opponents to her level. By limiting the ability power of champions to leave her kill zone, Cassiopeia dictates the ranges of an engagement, keeping foes at a distance where she can wail on them safely. Should her opponents play around Miasma, however, Cassiopeia loses that control and faces swift punishment from the champions she sought to keep at bay.


SMALL SCALE ADJUSTMENTS : Several of Cassiopeia’s other base stats have been slightly adjusted
ICONS : Cassiopeia has all-new ability icons

Serpentine Grace.png Passive - Serpentine Grace

SNAKES DON’T NEED BOOTS : Cassiopeia gains 4 movement speed per level. Cassiopeia cannot purchase Boots items.

Noxious Blast.png Q - Noxious Blast

COST : [40/50/60/70/80 mana] 60/65/70/75/80 mana
COOLDOWN : [4 seconds] 3.5 seconds
DAMAGE : [75/115/155/195/235] 75/120/165/210/255
RATIO : [0.45 ability power] 0.7 ability power
CAST RANGE : [850] 750
BONUS MOVEMENT SPEED ON HIT : [20%] 30/35/40/45/50%, decaying over the duration

Miasma.png W - Miasma
Cassiopeia spews venom in an arc in front of her, leaving toxic clouds fofew seconds. Enemies in the cloud are continually poisoned, slowing and Grounding them, prohibiting the use of movement abilities.

COST : 70 mana
COOLDOWN : 22/20/18/16/14 seconds
DURATION : 5 seconds
DAMAGE : 20/35/50/65/80 per second
RATIO : 0.15 ability power per second
SLOW : 40/50/60/70/80%, decaying over the duration
RANGE : 550-800

Twin Fang.png E - Twin Fang

COST : [50/60/70/80/90 mana] 60/65/70/75/80 mana
COOLDOWN : [5 seconds] 0.9 seconds
DAMAGE : [55/80/105/130/155] 52-120 (at levels 1-18)
RATIO : [0.55 ability power] 0.1 ability power
COOLDOWN RESET No longer reduces the cooldown to 0.5 seconds upon hitting a poisoned target
MANA POSITIVE No longer refunds an additional 1.5% of Cassiopeia’s maximum mana on kill (still refunds 100% of the cost)
SNAKE BITE If the target is Poisoned, Twin Fang deals an additional 10/40/70/100/130 (+0.35 ability power) damage
HEAL If the target is Poisoned, Twin Fang also heals Cassiopeia for 5/10/15/20/25
HEAL RATIO : 0.1 ability power

Petrifying Gaze.png R - Petrifying Gaze

COOLDOWN : [120/110/100 seconds] 120/100/80 seconds
SLOW : [60% on targets facing away] 40% on targets facing away


"These are two changes aimed at two different things, so we'll explain. First, while we did intend for late-game Cass to be an unstoppable force of a half-snake, the scaling heal on Twin Fang makes her borderline unkillable for some team compositions (particularly given her zone control). Second, when we were looking for ways to trim power on Cass, we saw that her champion update came right before our big refactor of the mana regeneration stat of the 2015 season (with most champions ending up with less mana regen in general). Given that these original numbers were tuned around competing mid-laners of the time (and higher baseline mana regeneration expectations like Athene's Unholy Grail), we decided to modernize accordingly. Cassi's still going to hit like a truck in the lategame - we just wanted to give more windows of opportunity for opponents to take advantage."
  • Aspect of the Serpent.png Passive - Aspect of the Serpent
    • PASSIVE BONUS : At 100 stacks, Twin Fang heals for6/8/10/12/14/16 +0.1 ability power +0.06 ability power
  • Twin Fang.png E - Twin Fang
    • MANA REFUND : If Twin Fang kills the target, it refunds its mana cost plus 3% of Cassiopeia's maximum mana 1.5% of Cassiopeia's maximum mana

Cassiopeia gets less AP when combined with %AP amplifying effects

"Last patch we modified how the first Dragon buff interacts with Rabadon's Deathcap (from multiplicative to additive, with an expected ~1-2% ability power change), but failed to document the larger hit to Cassiopeia, who was tripling (quadrupling?) down on it with her passive, Dragon buff, masteries, and Rabadon's Deathcap. We're documenting it now and realize this is late game Cassi nerf, but we're watching how this shakes out first. "
  • LATE GAME CASSI NERF : Dragon buff and Rabadon's Deathcap now interact additively rather than multiplicatively. When these two ability power % modifications (and masteries) interact with Cassiopeia passive, they now give roughly ~12% less bonus ability power at late, late game.

Q and E have higher mana costs.

"As a lane bully, one wrong move against Cassiopeia can lose you a ton of HP and send you ducking for cover beneath your tower (or just packing your bags and going home). While it's not impossible to fight back, Aspect of the Serpent's healing just reinforces this non-stop lane bully tactic without much in terms of tradeoffs (thanks to Twin Fang's mana recovery). Increasing Cass's mana costs on Q and E should make it more of a calculated decision to harass or sustain, giving savvy opponents more time to formulate a counter-attack (or at least walk back to lane)."
  • Noxious Blast.png Q - Noxious Blast
    • COST : 40/45/50/55/60 mana 40/50/60/70/80 mana
  • Twin Fang.png E - Twin Fang
    • COST : 35/45/55/65/75 mana 50/60/70/80/90 mana
    • CLARITY! : Twin Fang's tooltip now always displays the amount of mana it will restore

Aspect of the Serpent now gains stacks over time and every second an enemy champion is poisoned (rather than on poisoned unit kill or when using Twin Fangs on an enemy champ). Twin Fang now adds a debuff that amplifies poison damage on the target.

"Cassi's recent update definitely gave her the late-game we intended, but at two great costs: her early-game strength, and her identity as a 'Poison Mage.' We're trying to smooth out a bit of Cassiopeia's power here with some early buffs alongside some guaranteed scaling on her passive so that she can hit her early-mid-lategame fantasy (that is now a word) at the appropriate times. In short, we're looking to reach a middle ground between the update and her original feel of killing you slowly with venoms. Just quicker. (And with more venoms)."
  • Aspect of the Serpent.png Passive - Aspect of the Serpent
    • STACK CITY : Cassiopeia builds a stack of Aspect of the Serpent on every poisoned unit kill or on Twin Fang cast on enemy champion once every 6 seconds (10 times per minute) and for every second that an enemy champion is poisoned.
    • IT'S A BUFF WE PROMISE : Cassiopeia gains special bonuses at 75/200/400 stacks 100/250/500 stacks. The new breakpoints will be hit sooner than the old ones based on the new stacking mechanics (above).
  • Noxious Blast.png Q - Noxious Blast
    • EVERYTHING IS NORMAL : Fixed a bug where Noxious Blast's delay wasn't actually normalized (it was hitting anywhere between 0.25 seconds and 0.5 seconds). Now has a flat 0.4 second delay.
    • MOVEMENT SPEED BONUS : 10/15/20/25/30% bonus movement speed 20% bonus movement speed at all ranks
  • Twin Fang.png E - Twin Fang
    • [NEW] LOOK AT THIS SYNERGY : Twin Fang now adds a debuff on the target that amplifies further poison damage by +20% for 5 seconds. This debuff stacks up to 2 times (capping at +40% poison damage).
    • COST : 30/45/60/75/90 mana 35/45/55/65/75 mana
    • RATIO : 0.4/0.45/0.5/0.55/0.6 ability power .55 ability power at all ranks

Some small buffs to Cass's mana, Q's damage scales better with AP, and E's resetting its cooldowns correctly.

"We know Cass isn't doing great on the live environment, but we also want to make sure we don't react too quickly as players are learning a champion and then that champion goes on to demolish everyone (*cough* Kassadin *cough*). Still, we can give Cass a little bump as we watch her being picked up. This might be a conversation we'll revisit next patch! "
  • General
    • BASE MANA 300 ⇒ 330
    • MANA PER LEVEL +50 ⇒ +60
  • Noxious Blast.png Q - Noxious Blast
    • ABILITY POWER RATIO 0.35 ⇒ 0.45
  • Twin Fang.png E - Twin Fang
    • 28.6% MORE FIXED Twin Fang now correctly resets its cooldown to 0.7 seconds ⇒ 0.5 seconds, as indicated by the tooltip

Cassi's received a gameplay update! Focusing on her new passive Aspect of the Serpent, she's now more about stacking up poisons for massive end-game scaling than being a dominant laning force. Mana costs, cooldowns, base damage and ratios have all been mixed up to compensate - read below for the numbers!

"Cassiopeia's high DPS has always sat alongside her poison as defining characteristics of the serpent lady. Historically however, these traits have led to oppressive gameplay that's as challenging for the opponent to deal with as it is to understand (THANKS DAMAGE OVER TIME). To preserve both sides of what makes Cassi unique, we realized we had to modify the relationship between the two.
In this update, the key to Cassiopeia's heavy-hitting damage potential lies within her new passive, Aspect of the Serpent. Cassi builds power throughout the game as she poisons enemy champions, unlocking stat bonuses to fuel her (now more powerful) Twin Fang. This new aspect (heh) of growing her end-game scaling allows us to solidly push her into the 'completely-absurd-damage-potential' space she's currently hanging around. This comes at the cost of some early game power, but make no mistake - you can expect to see a late-game Cassiopeia as one of the most potent damage threats in the League."
  • General
    • TEXTURE UPDATE Cassiopeia's base and skin textures have been updated
    • SPLASH Cassiopeia's base splash art has been updated
    • VO Cassiopeia has received all-new VO
    • BIO Cassiopeia's in-client bio has been updated
  • AspectoftheSerpent.jpg NEW Passive - Aspect of the Serpent

Cassiopeia permanently gains a stack of Aspect of the Serpent for each second that she has poisoned an enemy champion, for each poisoned unit that she kills, and every time she hits an enemy champion with Twin Fang. Caps at 400 stacks.

  • 75 STACKS +5% ability power and Twin Fang restores 6/8/10/12/16 (+0.1 ability power) health
  • 200 STACKS Ability power bonus increased to +10% and Cassiopeia gains 25% cooldown reduction
  • 400 STACKS Ability power bonus increased to +30%
  • NoxiousBlast.jpg Q - Noxious Blast
    • BASE MAGIC DAMAGE 75/115/155/195/235 (unchanged)
    • AP RATIO +0.8 ability power ⇒ +0.35 ability power
    • MOVEMENT SPEED BONUS 10/15/20/25/30%
    • COOLDOWN 4 seconds
    • COST 40/45/50/55/60 mana
  • Miasma.jpg W - Miasma
    • MAGIC DAMAGE PER SECOND 25/35/45/55/65 (+0.15 ability power) ⇒ 10/15/20/25/30 (+0.1 ability power)
    • COOLDOWN 14/13/12/11/10 seconds
    • COST 40/50/60/70/80 mana
    • SLOW 25/30/35/40/45%
  • TwinFang.jpg E - Twin Fang
    • NEW PROBABLY BUILD MANA Now refunds Twin Fang's mana cost plus an additional 3% of Cassiopeia's total mana if Twin Fang kills a unit
    • KIND OF A BIG DEAL Twin Fang's cooldown now resets on cast, rather than on hit
    • BASE MAGIC DAMAGE 55/80/105/130/155
    • AP RATIO 0.55 ⇒ 0.4/0.45/0.5/0.55/0.6
    • COST 30/45/60/70/90 mana
  • PetrifyingGaze.jpg R - Petrifying Gaze
    • SNAKE EYES Now accurately hits units directly in front and on top of Cassiopeia.
    • MAGIC DAMAGE 150/250/350 (+0.5 ability power)
    • COOLDOWN 120/110/100 seconds

Updated Splashes

"As we've mentioned previously, the splash art team is engaged in a long-term effort to update our oldest base splashes. We've got a few more fresh updates for this patch. Yes, this is the same context we used in 4.15. "
  • SPLASH The following champions have received updated base splashes (click the portraits for the full image!):

v4.15 (Twisted Treeline)

"Miasma can be a bit overbearing on Twisted Treeline. This change, combined with the nerf to TT's mana regen aura, should make her more reasonable."
  • Miasma.jpg W - Miasma
    • BASE MAGIC DAMAGE PER SECOND 25/35/45/55/65 ⇒ 20/30/40/50/60
    • MAXIMUM POTENTIAL MAGIC DAMAGE 225/315/405/495/585 ⇒ 180/270/360/450/540

v3.12 Context: The cost of Cassiopeia's Petrifying Gaze is too damn high. To remedy this, we've reduced its mana cost at all levels to bring it more in line with other ultimate abilities.

  • Petrifying Gaze
    • Mana cost reduced to 100 (from 120/160/200)


  • Twin Fang
    • Now counts as a single target spell for the sake of items like Rylai's Crystal Scepter.


  • Base Movement Speed increased by 25.


  • Updated art assets


  • Fixed a bug where Miasma's slow was not stacking with many other slows in the game
  • Noxious Blast ability power ratio reduced to 0.8 from 0.9
  • Twin Fang damage reduced to 50 / 85 / 120 / 155 / 190 from 60 / 95 / 130 / 165 / 200


  • Miasma now gives persistent vision in the area where cast


  • Twin Fang cast animation sped up
  • Petrifying Gaze
    • Cast animation sped up
    • Cast range increased to 850 from 700 (effect now roughly matches the particle)
    • Damage increased to 200 / 325 / 450 from 150 / 275 / 400
    • Cooldown reduction with rank is now reflected in the levelup tooltip
    • More accurately targets enemies that move in/out of the area during the cast time


  • Updated tooltips


  • Twin Fang range increased to 700 form 675


  • Base movement speed increased to 310 from 305
  • Noxious Blast movement speed buff increased to 3 seconds from 2
  • Twin Fang ability power ratio increased to 0.55 from 0.45
  • Petrifying Gaze
    • Slow increased to 60% at all levels from 40 / 50 / 60%
    • Cooldown changed to 130 / 120 / 110 seconds from 120 at all levels

CassiopeiaSquare.pngCassiopeia released

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