Hemolytic Poison sphere.
Part "stacks 3 times - it stacks infinite times."
Also it stacks even without sphere.
proof:
http://savepic.ru/11782019.jpg
http://savepic.ru/11751299.jpg
Oponion: I don't feel it like realy bad cause - we cau use it on only realy fat bosses...And it's realy cool way to kill them - it needs much time to stack to be usefull,so why not let people use it?)
(better use ranged attacks with faster speed and more projectiles weapon to reproduct it)