Zemouregal was a Mahjarrat that died on Freneskae, and the father of Zemouregal. He attempted to lead a group of Mahjarrat including his mate to perform a Ritual of Enervation. Only he and his mate survived, though she was badly wounded by what is described to be a grand force muspah and was too weak to provide the energy necessary for the ritual. Zemouregal provided the energy himself, dying in the process, but sired a powerful son. His deathstone is found on Freneskae during and after the Children of Mah quest.
Finding his deathstone, alongside the other three, is a requirement for the master quest cape.