The Warrens were tunnels underneath the Dock Ward and Castle Ward in Waterdeep. The Warrens had existed for hundreds of years by the late 15th century DR and were inhabited primarily by gnomes and halflings. The existence of the tunnels was unknown to most Waterdhavians until the gnomes told the halfings about the tunnels and the halflings told everyone else.
There was a temple dedicated to Baravar Cloakshadow located within the Warrens. The elder high priest of the temple, as of 1479 DR, was Ompahr Daergech. His great-great-great-granddaughter, Roywyn Daergech was also a priest at the temple.