I have a 4th level halfling monk lying around from another campaign. When he was child his family was heading back home from visiting friends for dinner when they were waylaid by bandits. Milo was struck in the face, leaving a scar, which knocked him out. With all the blood the child was left for dead. He was found by monks who brought them back to their school. He trained and served there. He is still plagued by nightmares of that dreadful night which at times bring on a blood lust when in combat. He has strived for enlightenment, but these memories have always come in the way. He has left the school to journey out into the world to either find revenge or a release from these memories that plague him. Let me know if you need something specific for your group as I can make something else up. Thanks for the offer.