Lunar Scavenger

'''Lunar Scavengers''' are dormant, major-level enemies hidden beneath the surface of the Moon, shown with a yellow health bar. They do not attack until approached. Defeating one triggers waves of other enemies, and clearing them makes a chest appear.

The chest is the first step of the Memory of Eriana-3 quest from Eris Morn, and looting it gives the Letter from Wei Ning. A November 2019 guide says spawn locations rotate weekly and lists Traitor's Ketch, The Gatehouse, Circle of Bones, The World's Grave and Chamber of Night as possible spots, so check current guides for the active locations.