A millennium ago, Onaga, also known as the Dragon King, was the true ruler of Outworld. Hoping to gain eternal life, he ordered the last known dragon egg to be kept, hoping that the blood of an infant dragon would grant him immortality. However, he died before this could be fulfilled. Shao Kahn, one of his chief advisers, had him poisoned and took over his rule of Outworld. His army, however, was kept in a mummified state. This army was considered undefeatable because Onaga possessed the innate power to raise the dead. By means of constant resurrection during battles, his army truly was undefeatable. During the millennia that followed, Onaga was apparently forgotten.