Onaga, The Dragon King, formed the greatest army that Outworld had ever known; an army so powerful that it had never lost a battle. When Onaga was killed by Shao Kahn, his army was entombed along with him.

For millennia, this army of undead warriors would remain undiscovered in their tomb, until Quan Chi discovered their location after his escape from the Netherrealm. Revived and controlled by Shang Tsung and Quan Chi, the army was used to invade other realms in the Deadly Alliance's quest for power.

After Onaga's return and eventual defeat, it was revealed that the army was only undefeatable due to his ability to constantly resurrect them during battle.

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