120 AP item idea

K so it has an active that places a mark on someone, in the same way that akali q does. While the target that's marked stays within auto attack range of your champion either get a debuff or your dmg is amplified against them or they take %health dmg per second or get some kind of magic damage dot on them. or you could siphon health off of them per second... anyways some kind of effect you decide.

So the mark last like 4.5 seconds which is long. At any point and time while the enemy is in your auto attack range you can stun them by pressing the key your item is located on. Stunning them ends the dot/debuff.. you placed on them.

So the idea is to try to stay close to them for its whole during and let them take damage and threaten them from turning on you by stunning them.

This could help counter to katarina. especially if your team lacks hard cc. its sort of like a dead man switch. it says to kat players if you jump me ill just stun you. Works best if you engage her.

its also great because its guaranteed cc (not skill shot) which kat can be tricky to hit. This could be good on a brand for example because all too often by the time you set kat ablaze and stun her she already got her ult off.

The item would also have a short cdr of like 30seconds and can be reduced by 2 seconds for each successful spell you land on a champion.