When the Death Knights of Archerus attacked the Scarlet Enclave, the prisoners held there became prisoners of the Scourge. Many of these prisoners had previously known the heroes who had become the Death Knights, and these prisoners were reserved to be slain by their former friends.
Lady Eonys had once been friends with the Blood Elf Death Knight Champion, and was shocked to see her comrade from Silvermoon City in the control of the Lich King. Though she pled for the Death Knight to fight against the control of the Lich King, she still fell victim to the Scourge champion's blade.
Lady Eonys is a character in World of Warcraft: Wrath of the Lich King.