After a certain number of Kabuto kills, if you manage to bring him to 1 HP you can attempt to capture him and if you manage to, (10% chance?) he surrenders offering to teach you a powerful art for his freedom. you have two choices.
Turn Kabuto in to authorities - You take the now tied up Kabuto back through the forest and in to town, you reach the prison facility and a tall figure behind a long mahogany desk. "Ah! You've managed to catch Kabuto! A shame we couldn't find him... But anyway, you came for the bounty, correct?" The prison warden fumbles through the coffers and hands you a slip of paper with a signature pre-written upon it, you curl your fist around it and place it in your pouch. "Take it to the bank, they will supply to you the bounty." (effect: when you go to the bank you can turn it in for 35 gems and 10,000 gold. your good also increases.)
Learn technique from Kabuto - You carefully untie him and he stands up then, as promised, he takes you deep in to the forest and you begin intensive training with him... after several hours you leave the forest having learned a new technique though allowing darkness to return to the forest... (effect: you return to town with increased evil and a new technique in whichever jutsu you're currently in that costs 5 chakra to use, is available irrelevant to chakra affinity until reborn and usable at level 1.)
Opinions?