Ermac was created with dark magicks by the former emperor of Outworld, Shao Kahn. He is a collection of souls, those of the thousands of warriors vanquished in Shao Kahn's conquest of Edenia. After Shao Kahn's death, Ermac remained loyal to subsequent Outworld emperors: first Shao Kahn's chosen successor, Mileena, then the usurper, Kotal Kahn. He is now a key component in the emperor's efforts to quell Mileena's rebellion.

~ Mortal Kombat X