As Kratos' son, Atreus inherited the power of Spartan Rage from him. However, during his early life, he would fall ill whenever he became too angry, signified by physical weakness and a hacking cough. In God of War (2018), Atreus activates Spartan Rage for the first time when Modi is about to kill Kratos; Due to the circumstances of Kratos hiding his godly heritage from him, he would fall into a deeply feverish, catatonic state that threatened to kill him without the assistance of Freya.