Location Broken Valley Village
From Brave Sir Robin (Black Boar inn)
Rewards XP & gold
1 additional option
Robin's Gauntlets

Talk to Robin in the Black Boar inn to get the quest. You need to present him with proof of a better kill than his: either a demon claw (from the demon summoned by Bellegar, or by George Gremory). He will then give you Robin's Gauntlets as a reward.
Note: There's a reference to the Killer Bunny (level 22) in Robin's book (on the table in the tavern). If you kill 30+ bunnies, it will appear. It doesn't go into the water, so you can shoot it with arrows or magic from safety if you're near a stream. It will drop some pretty neat random loot.