Deidra Finian was a Sinlarine necromancer, member of the Finian Clan and an excellent singer. She was an associate and lover of Thanatos Barca as well as the leader of a band of demon guardians which included Philos. She encountered the Dresdens while on a quest to retrieve information from Etheril on Thanatos's orders and got involved in a complex web of deception. Her stubbornness, code of honour and mistrust of the Dresdens eventually led to her death by Razravkar Dominus. She later returned as a spirit to aid the Dresdens, sacrificing herself to seal a demon portal and prevent Illunii from being invaded by the Eastern Horde. Since then her spirit has been stuck wandering in the Void and has occasionally lent her aid to various people albeit in a limited manner.