Mumta

Mumta, the thief of souls, can be found atop the Hall of the Grand Imperion, the southern building of the Court of Bones on the southwestern side of the Isle of Thunder.

Strategy
Interrupt Spirit Bolts and kite/run away from the spawned Vengeful Spirit, which will despawn after 30 seconds or so. Most of the time, all combatants will be afflicted with Darkest Darkness, so try to not take any excessive damage.

Achievements

 * Champions of Lei Shen

Reputation

 * +100 The Black Prince