Quartered Ancient Ring

Four Quartered Ancient Rings can be found in Perdition Hold during the Necrolord Assault. Combine all four to form Nilganihmaht's Stone Ring, itself a requirement to recover Nilganihmaht Control Ring, a crawling hand mount.

* Found inside a random Mawsworn Cache atop the walls of Perdition Hold during the Necrolord Assault. Must be in the Overcharged Centurion when Putting A Plan Together is active.
 * Reward for Clearing the Walls, requires Putting A Plan Together and the Overcharged Centurion
 * Kill the Mad Maw Construct that frequently spawns during the Necrolord Assault after looting another ring quarter
 * On the ground at various spots in Perdition Hold, including near Shadeweaver Zeris

Once all four have been acquired (in any order), head to Zovaal's Cauldron and use one of the rings while standing near a Soulsteel Forge &mdash; two forges are near the Stygian Incinerator &mdash; and combine the four into Nilganihmaht's Stone Ring.