A member of the explorer society drank too much, and was possibly killed in a brawl in the Jolly Axeman Tavern.
North side of The Jolly Axeman Tavern in Kazordoon
- Go to The Jolly Axeman Tavern in Kazordoon.(here)
- In upper side of room you will see 4 sewer gates.
- Go down, kill rat and take Explorer Brooch from body.
You can trade the brooch with Mortimer in the explorer society building in Northport for 50 gp.