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Cassiopeia Build Guide by sfsom
A Competitive Guide to Casseiopeia
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9x mana regen/lvl seals - best in slot; cass needs the mana since her abilities cost quite a bit of mana
9x flat ap glyphs - my personal favorite; i feel casseiopeia's early game is ridiculously strong. you can harass heavily against almost any champ in a solo lane. may be replaced with ap/lvl glyphs
3x flat ap quints - same as the glyphs; makes cass' early game ridiculously strong!
Her ult is extremely powerful. Getting chased by 3 enemies? Run into a bush and ult them when they enter. They all get stunned and get hit heavily, allowing you to get away or saving enough time for your team to come in and clean them up. Make sure to hit as many as possible facing you. Use flash if the opportunities presents itself to position yourself to hit all of the opposing team.
2. Cass relies on damage over time.
Take note of this. Watch your dot from miasma and noxious blast carefully and practice estimating when an enemy champion will die from it. This will allow you to switch targets and focus on another enemy champion, possibly allowing you to help get kills that you otherwise would not have had you kept chasing an enemy that was already going to die.
3. Cass' early game is ridiculous.
HARASS HARASS HARASS. Her early game damage with flat ap quints and glyphs is absolutely crazy. Learn to hit noxious blast and quickly following it up with twin fang for a couple extra hits of damage. Remember that twin fang's cooldown goes to 0.5 secs on an enemy champion effected by noxious blast or miasma. Use ignite when you're confident in for a kill. You will dominate your lane against most champions.
4. Get blue buff whenever possible.
Have your team give your blue buff to allow you to spam your abilities and to boost your AP damage. The extra duration from neutral buffs in the utility tree benefits greatly.
5. Drop miasma wisely.
The poison damage is crazy and it also slows. Drop it into spots where the enemies will stay on it as long as possible. In team fights, drop it where multiple disables from your team will keep them still. Another area you should try to put it is on your teammates that are being focused, especially if it is your tank. If the opportunity never presents itself, drop it on yourself or your team's carries to help making the opposing team weary from jumping on you.