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You can manage & track your card collection and decks once you create an account and login.
No. Fortress Maximus is just like other character cards with a body, except it's bigger, and it must have Cerebros as its head. Cerebros is unique in that it has both a head mode and a body mode. So it starts the game attached to Fortress Maximus, but you also get another head to put onto Cerebros. This can be Emissary or any other character with a head mode.
The stars from all three cards count toward the 25-star limit. Note that Fortress Maximus, Cerebros, and Emissary have 25 stars combined.
