The Jesters- Venore - The jester spawns in venore, This boss hits hard and is very tough to kill with his two friends nearby. He summons his two joker friends who heal him over 100k at a time making it very hard to kill him.
Best way to kill him is to either ROPE up the summons, or to kill them very quickly.
J also drops the jester out and in addition he drops something called the knife. YOu use the knife, and whenever you click a zydrate you will receive a 30 minute hp mana buff with additional mana and hp regen.