Erlik Khan (Mongolian: Erleg Khan), one of the sons of Tengri, is the ruler of the underworld. He controls the souls here, some of them waiting to be reborn again. Extremely evil souls were believed to be extinguished forever in Ela Guren. If a sick human is not dead yet, a shaman can move to the underworld to negotiate with Erlik to bring the person back to life. If he fails, the person dies.