Brave Sir Robin is a character located in the Black Boar Tavern on the second floor. He gives quest The Greater Hunter.
You can mind read him for 400 exp to find the password for his storage located in the western part of Broken Valley under a huge tree. Within you will find a chest with several items and the Wild Dwellers Composite Bow.
When you open the chest in his storage three level 10 armored boars will be summoned to attack you.
Brave Sir Robin is a reference to Monty Python and The Holy Grail. His hunter's log also mentions the Killer Bunny, and after reading it you open a dialogue option that allows you to tease him about it.