Anub’ankhptah. Mother to Anub’arak – the last queen of Ahn'kahet: The Old Kingdom. Believed to have been slain during the War of the Spider she has returned once again. Though now allied with the Scourge, she fights not for the Lich King but to defend the catacombs that are her home. Those who enter her crypts are confronted with hordes able to appear and disappear seemingly at will. Her attacks are as subtle as she is devious often only showing an enemy his true mortality long after it is too late. At first believed to be immortal, her immediate return to battlefields after rare confirmed kills has led the Sentinel to believe that the Nerubian Queen is not one - but many.
Revised from the previous one.
Note: Anub'ankhptah (my thats a mouthful) could possibly have existed within Warcraft Lore, and there is no conflict with Broodmother. The Nerubian queen held the title before her time, and technically Anub'arak was a Nerubian prince who fell in the Second War of the Spider. He was then resurrected and turned by Arthas.
I strongly suggest you read this page and maybe change the name of the hero into something that might be recognized as I believe the Anub' title is for males.
Perhaps Nezar'Azret who already exists within Warcraft Lore and is currently unused by anything. But then I doubt, although still possible, that she could have mothered Anub'arak. (Actually still possible).