Key to River Plug

Key to River Plug is a quest item needed to open the plug that will flood the mines, the old home of the dwarven clan Orothair. It is dropped by Daveron at the end of Chapter Four. It will not be used in the process and can be sold to some stores for 5 gold coins.

In-game description
"This key is a magical instrument used to bypass the arcane glyphs that seal the river plug on the first level of the mines."