It could be in every in every tavern or village. Make every visit in every place worthwhile.
For example :
Hunt 10 small rabid dog = 1 medium potion
Hunt 10 forest serpent = 1 potion of courage
It makes the game more interesting especially for players who already finish the game, and new player to help with fighting bosses.
I just got this idea after defeating the Arulir pack leader at lvl 40
