The blood sister of Yessanna and Cyssandra, Aylessa ruled over the undead and mortals of the Nightlands and the River of Souls on her makers behalf. Her domain which stretched from the Arch of Secrets to the Deathlord’s Gate she surveyed from her stately barge-keep ensuring that all within bowed to the whims of her mistress and in turn her master, Nagash.
In the Age of Sigmar, the Ironjawz Megaboss Dakkbad Grotkicker invaded her territory even as she was hastening to the aid of the besieged Neferata. He quickly besieged and sacked the deathrattle city of Crookback, part of her domain and in response she moved to confront the rampaging horde.
Although she unleashed her Morghast attendants and mighty armies of undead upon him, he was unbowed and dared assault her barge itself. As Aylessa and her returning Morghasts were slaughtering her way through his orruks, he smashed her coven and then plunged his maw-krusha, Skullzcrakka into the side of her vessel. His laughter as her once grand and graceful ship vanished beneath the waves has spurred Aylessa to pursue him across the realm of Shyish and beyond, thirsting for vengeance.