Revenants
From UnderlightWiki
Revenants are dreamerlike creatures that mostly reside in the Palisade and Lower Palisade. However, they have been known to infest the Cenotaph of Dread and Edgeward Barrows and other areas of Underlight. They are NPCs that you can fight for the reward of experience points and items. Beware, they can evoke various arts on dreamers as well.