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What do you do when Fortress Maximus is KO'd?

If Fortress Maximus is KO'd, you put Cerebros back onto the battlefield in body mode, with its head still attached. Because a character can't flip into head mode, Cerebros won't be able to flip while it's on the battlefield. If Cerebros is KO'd, you put its head onto the battlefield in bot mode.
Source: Wizards of the Coast (2020-05-09)    【Link to Ruling】
Tags: Fortress Maximus, Great War Veteran