Wanting a three stars? As you can farm it freely with letting him go, he don't drop anything.

Hm, if you have Eden, you might want to powerlevel a tough enough bandit to tank one hit for her (than withdraw and let her paralyze him twice to buy you a good chunk of time to burn him down with all the witches you can stick around (five slots, one of which needs Increase Range one), and than resort to Karma tanking.

That or pile as many Assasinate on him as possible and pray for that 1% to happen