A One-Round Living Greyhawk Yeomanry Regional Adventure
From the introduction:
Another call for assistance from the Watchers of the Stone brings you back to the peculiar town of Kelzad. They ask that you journey into the Underoerth and retrieve an ancient weapon. Will your deeds bring renewed hope to the Yeomanry or will you lose yourselves in the endless night beneath the surface of Oerth?
A Yeomanry regional adventure for [character levels] 6 - 12, and Part Two of the Return of the Deliverer series.