Eilethriz is a Drow raised in a temple outside of Nevungwe, but was taken from in and became a servant of house Drasvei. With years passing she developed clearer combat skills and eventually became a soldier.
When the Drasvei house raided the surface land Sephira she ran into the W.A.R.D.S. She saw her opportunity to get back at the Drasvei. She helped the W.A.R.D.S kill them, and then helped them get in contact with "The harvester".
After that she gathered her things on her pet spider Airan and rode off.