While its small bonuses to mana and life prevent Biggin's Bonnet from being useful past early game, it also possesses an off-slot bonus to all damage dealt from a weapon. This bonus can be helpful in some occasions, such as a hero's life stealing capability being insufficient.
Due to its very low item level, it is usually found in NormalAct I. At the same time, its high uqlvl makes it a very rare drop. As such, one can only very rarely see this item in game.