The name that the Daria Morgendorffer from Earth D-899 (who possesses one of the Vengeance Rings) is known by during the events of Let Vengeance Ring. She had an affinity for quintessence and was one of the most effective opertives for the Lost Ringbearers. The first time she encounted the Dominator, he mentioned that she had already kill 178 Ringwaiths and metahumans. At the end of the Vengeance Ring Crisis, her entire reality is reset and she is able to live a normal life, without any knowledge of what has happened.
A prequel to Brother Grimace's "The Gift of the Ringwraiths" and part of the "Judith Strikes" Shared World. While causing a paradox by collecting the Vengeance Ring of Ian Llywd, Judith encounters Daria Wraithkiller and learns how far into the darkness Wraithkiller had gone.