Patches

Patches is a mini-boss in that can be turned into a merchant based on one's actions.

He resides in Murkwater Cave but won't show himself until his chest is looted in the boss chamber. However, once he's knocked down to half health, he'll ask for mercy, in which case one can spare him or kill him. If allowed to live, he'll remark on becoming a merchant and for you to visit him later. True to his word, he'll have stuff to sell on the next visit, calling his business Patches' Emporium.