Tomb Husk

A Tomb Husk has had three purposes. In the mission Lost To Light, after escaping the ambush, you must find these tomb husks to unlock the doors and escape the Hellmouth. In Last Rites, to build and cross the bridge to steal Crota's soul, you must grab and place the tomb husk on the middle plate. Finally, in Summoner's Circle, you must grab the tomb husk and place it to summon the Infantine ogre.