Altar of Blood

Elena Idra was a descendant of clan of dark mages like Schreder. She, in fact, is basically of same lineage as Valkyries. She followed Schreder around like a brother when they were child. However, her parents later on caused the downfall of clan of Schreder.
With strong magical powers, she served Macuapel Sect as a dark mage early in her life and secretly supported Schreder in his battles. At the battle of Leticia, she instinctively knew that this was going to be final battle and she planted seed of Dark Peacock, a being worshiped in her clan, sacrificing herself to gain more strong power.
She fought with Great Magician Larosh and died in the battle.