Nightseer

Keleios was a child when her mother, Elwine the Gentle, was slain by the malevolent witch Harque. Now Keleios's prayers of avenging her death have finally been answered: she has been granted powers beyond anything she has ever known. But she has also acquired something else--the demonmark. As magical as it is terrifying, the demonmark can open the door to undreamed possibilities. It can also expose her soul to the darkest and most forbidden forces of sorcery.