Lelyias

Lelyias is an undead dark ranger who remained loyal to Sylvanas Windrunner after the Fourth War and accompanied Nathanos Blightcaller and Sira Moonwarden on their mission to kill the loa Bwonsamdi. She frequently served as a scout in the conflict and according to Sira, is a skilled enough healer that she could heal Apari, their ally and leader of the Widow's Bite, of the leg wound that was slowly killing the troll.

Lelyias joined the final battle against Bwonsamdi at his Necropolis, only for the loa to be reinforced by the armies of the Horde and Zandalari Empire who turned the tide of battle in his favor. While Nathanos was able to escape the battlefield, and Sira was captured and taken prisoner, Lelyias' fate is unknown.

Speculation
Lelyias may have been among the many dark rangers who lost their lives to the Horde and Bwonsamdi. Alternatively, she may have found a way to escape the conflict as Nathanos had.