The lieutenant of Klyss the Necromancer and avatar of the god Morgath, Myrvria recruits souls to the ranks of the undead. She bargains with mortals, offering "eternal life" or "the heart's desire" to those who will speak the Unholy Oath:
“To own myne form, when breath hath fled, shall I gift myne soul.”
When someone utters this line thirteen times at the conclusion of an appropriate ceremony, he has sealed a pact with Morgath.