[Passive]Aspect of the Serpent
Old passive: removed!
New passive: Cassiopeia gains a stack of Aspect of the Serpent for each second that an enemy champion is poisoned and for each poisoned unit that she kills. Her ability power is increased by 1% for every 25 stacks, up to a max of 375 stacks.
At 50 stacks, Twin Fang now heals Cassiopeia for 6/8/10/12/16 (+0.1 ability power)
At 150 stacks, Cassioepeia gains 30% CDR
At 375 stacks, the AP bonus from Aspect of the Serpent is doubled.
[Q]Noxious Blast
Provides Cassiopeia more movement speed later in the game but, in turn, deals less damage.
Damage: 70/105/140/175/210 (+0.35 ability power)
Movement speed: 10/15/20/25/30%
Cooldown: 4 seconds
Mana cost: 40/45/50/55/60
Delay increased by 0.05 seconds
[W]Miasma
Now a notably more powerful slow tool but has a higher cooldown and deals less damage.
Damage per second: 10/15/20/25/30 (+0.1 ability power)
Cooldown: 15 seconds
Mana cost: 40/50/60/70/80
Slow: 15/22.5/30/37.5/45%
[E]Twin Fang
Is now MUCH more reliable when checking for poisoned targets and has a higher AP ratio later in the game. Also, now grants mana upon killing a unit.
Damage: 55/80/105/130/155 (+0.4/0.45/0.5/0.55/0.6 ability power)
Mana cost: 30/45/60/75/90
Utility: Now refunds its mana cost plus an additional 3% of Cassiopeia's total mana when it kills a unit.
Usability: Now has additional checks in place to see if target was poisoned.
[R]Petrifying Gaze
Lower cooldown, but also slightly lower damage.
Damage: 150/250/350 (+0.5 ability power)
Cooldown: 120/110/100
And that's it. I'm sure Cassiopeia veterans out there have some concerns about some of these damage changes, so I'd like to highlight a few things. The reliability change to Twin Fang cannot be understated. This has huge implications on her DPS potential. More E's with a higher ratio = more DPS. For anyone used to playing Cassiopeia, you'll notice a difference immediately. Much of her kit has been restructured to make Twin Fang more accessible 30% CDR, buffed movespeed on Q, a buffed slow on W, and a lower cooldown on R all come together to make Cassiopeia's damage more readily available. Additionally, the life on hit on Twin Fang allows Cassiopeia to stay in fights for longer periods of time, much like lifesteal does for AD carries. This means Cassiopeia will be free to do more damage over the course of a fight. Aspect of the Serpent grants Cassiopeia significant AP in the late game. This'll help make up for some of the base damage tuning, but also simply give her more damage than ever before at full build.