Cassiopia is a ranged ap carry who can deall massive amounts of magic damage and carry as well as play safer and support. Howerver this guide is only for an aggresive mid cassiopia. So basically cassiopia is a teemo with no shrooms and longer range, witch makes her ideal for mid lane. Due to the devistating effects of her poisen and ult cassiopia can be a giant threat and a giant target. Therefore even though you are an aggresive character you need to be cautious yet daring. Meaning dont take giant chances but dont be afraid to punish anyone who is in your way. Now without further adu i present cassiopia the gassy lassy.(please take note that this is my first guide and im no pro so dont be to critical)

I picked the greater mark of insight for cassiopia because the magic penitation really benifits you greatly against a team that is building mr if u have no magic penitration you will do absolutly nothing to them. Next is the seal of replenishment, the thing about this one is that simply without mana cassiopia is useless. Then theres the glyph of potency, i prefer this rune over force for cassiopia because the items your building will make your ap more then adequite late game therefore more ap.early game is the obvious choice. The same theory goes for the quintessence.

Well these are basically the same masteries for any ranged ap carry that have been tested countless times before. So nothing original in this area

Well of course you need to start with boots and pots, you can either go 3 health or 2 health and 1 mana. I would not recommend going with 2 mana and 1 health because cassiopia is just too squishy for that l. But if you play safe it can be done. Next ur gonna want to build some ap and sense its early game amplifying tone is perfect because of its cheap cost. After you have more ap then you want it to go through as much as possible and sorcerer's shoes are the perfect way to increse your mobility and hurt your enemies. After youve got some fesh kicks and a good book your gonna want a bit more reading material and i hear fiendish codex is a knock out not only does it give you ability power but a bit of mana regen. As well. Then your gonna want some mr to protect yourself from bullies so get a chalice of harmony. By now its mid game and your gonna need somemore ap so pick up a blasting wand.then get an unholy grail for more ap and mana regen. After this you just build ap with witchcap crystal sypter etc.

Your q is your harass and your main damage dealer, it also poisons however its a skill shot so youll need some practice for it to be successful. Definitly nmax first. Second is your e. Basically it just does damage but when your opponentnis poisoned it has pretty much no cooldown max this secondnand pairnwith your q or e. Your last max will be w it is a slownthat poisons you maxnit last because your q is simply worth more in a fight as well as e. And of course theres her ultnwhich stuns all enemys in range that are facing her and slows ones that arent facing her it also does a substantial amount of damage use it at the begging of team fights or when being chased.

Flash and exaust are what i find to be the best because they can be offensive and defensive. Other choices are ghost and ignite.

I hope this guide helped you master cassiopia and have a bit of fun. Please comment on hownit and i can improve. Thank you xD