Slither, the Crawling Citadel, is the base of operations for Yarnath the defiler, who created this crawling citadel of bone. Yarnath leads a band of raiders that primarily target trade caravans on the way to Altaruk or the Silver Spring Oasis.

The fortress appeared to have been immobilized following the destruction of Yarnath and the hands of Gwyn, Kelvor, Morg, Vinara and their allies.