Zaurak Keep is a fortress that existed during the Age of the Gods (era) on the continent of the same name. It is home to the Dark Brethren with its inner throne room being their connection to this world. That room is also the site where Malpercio as an entity was first formed as the five siblings accepted the Brethren's power to fight Wiseman.
A thousand years later, once Malpercio was released, its remnants emerged from another dimension as Cor Hydrae.