Sathera was a high elven mage who was a close friend of Antonidas. She teleported into the Violet Citadel's Arcane Vault when the alarm was sounded. It had been infiltrated by Teron Gorefiend and his death knights, who had been sent by Ner'zhul to retrieve the Eye of Dalaran.
Antonidas had been afflicted by some dark spell cast by one of the death knights, but Sathera lifted the spell, saving her old friend. Soon afterwards, one of the death knights targeted her and blasted her with dark magic. She withered before Antonidas' eyes, and fell to the ground, dead. ( )