The Champions of Rajaat
While not general knowledge, those more educated know of the purpose of the Ziggurat. It was designed by the late King as a focus with which to draw the life energies of the citizens of Tyr, in order to flood Kalak with arcane power. Enough power to rival The Dragon of Tyr, some say. He was assassinated by Tithian and some members of the Veiled Alliance while in the middle of this ritual, deep in the Ziggurat.