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The Serpent's Embrace
Real Name:Cassiopeia du Couteau
Release Date:December 14th, 2010
Cost:4800 BE
880 RP
Health Regen HealthRegen Mini Icon.png :525 (+ 1.2)
Mana Mana Mini Icon.png :375 (+ 60)
Mana Regen ManaRegen Mini Icon.png :1.6 (+ 0.15)
Movespeed MovementSpeed Mini Icon.png :328
Attack Damage AttackDamage Mini Icon.png :53 (+ 3)
Attack Speed AttackSpeed Mini Icon.png :0.647 (+ 1.68%)
Range Range Mini Icon.png :550
Armor Armor Mini Icon.png :25 (+ 3.4)
Magic Resist MagicResist Mini Icon.png :30 (+ 0)


PassiveSerpentine Grace
(Innate) Cassiopeia gains Movement Speed per level. Cassiopeia cannot purchase Boots items.
Movement Speed: 4 x level

QNoxious Blast  
(Active) Blasts enemies in an area with Template:Kw. If a champion is hit, Cassiopeia gains Movement Speed decaying over 3 seconds.

Template:Kw deals magic damage over 3 seconds.

Cooldown: 3.5 seconds
Cost: 60 / 65 / 70 / 75 / 80 mana
Movement Speed: 30 / 35 / 40 / 45 / 50%

(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.

Cost: 70 mana
Cooldown: 18 / 17 / 16 / 15 /14 seconds
Magic Damage: 20 / 35 / 50 / 65 / 80
(+15% of Ability Power)
Slow: 40 / 50 / 60 / 70 / 80%

ETwin Fang  
(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 Template:Kw when Twin Fang hits, it takes additional magic damage and heals Cassiopeia.

Cooldown: 0.75 seconds
Cost: 40 / 50 / 60 / 70 / 80 mana
Magic Damage: 52 - 120
(+10% of Ability Power)
Additional Damage: 10 / 40 / 70 / 100 / 130
(+35% of Ability Power)
Heal: 5 / 10 / 15 / 20 / 25
(+10% of Ability Power)

RPetrifying Gaze  
(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%.
Cost: 100 mana
Cooldown: 120 / 100 / 80 seconds
Magic Damage: 150 / 250 / 350
(+50% of Ability Power)

Patch History


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.

  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

25px W - Miasma

COOLDOWN : 22/20/18/16/14 seconds 18/17/16/15/14 seconds
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.

  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

  Passive - Serpentine Grace

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

  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

25px 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

  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
REMOVED COOLDOWN RESET : No longer reduces the cooldown to 0.5 seconds upon hitting a poisoned target
REMOVED MANA POSITIVE : No longer refunds an additional 1.5% of Cassiopeia’s maximum mana on kill (still refunds 100% of the cost)
NEW SNAKE BITE : If the target is Poisoned, Twin Fang deals an additional 10/40/70/100/130 (+0.35 ability power) damage
NEW HEAL : If the target is Poisoned, Twin Fang also heals Cassiopeia for 5/10/15/20/25
HEAL RATIO : 0.1 ability power

  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."
  •   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
  •   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)."
  •   Q - Noxious Blast
    • COST : 40/45/50/55/60 mana 40/50/60/70/80 mana
  •   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)."
  •   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).
  •   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
  •   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
  •   Q - Noxious Blast
    • ABILITY POWER RATIO 0.35 ⇒ 0.45
  •   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
  •   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%
  •   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
  •   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%
  •   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
  •   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."
  •   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