The third pile of corpses to be raised in My Dead Brother

"Resurrect corpses" is an objective in the sidequest My Dead Brother in Tiny Tina's Assault on Dragon Keep DLC

Walkthrough[edit]

Head to the South from the Bone Barracks. Deal with all the Skeletons if you want as you run into the hallway to the South. Go through the circular corridor which has even more Skeletons inside it. At the far end of it you will find an elevator to take up. Do so then continue to the South through the Hall of the Dead. Just go straight on through and open the door across from you. Head on down the corridor to the South and make your way into the Seer's Sanctum.

There is a raised platform in the Northern portion of this room. Head to the center and find the sword with a skull on it. Interact with it to summon the next round of Skeletons. This is the final set and easily the hardest.