10. Alexander
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Alexander has appeared in many of the Final Fantasy games, usually taking the form of a giant mechanized fortress or castle and generally causing massive amounts of holy damage. It’s always an imposing sight, with plenty of damage to back it up. In Final Fantasy XIV, Alexander is an end-game raid where players have to enter the creature’s body to defeat it.
Although it isn’t a usable summon, Alexander appears in the main story of Final Fantasy IX, where players must guard Alexandria Castle from the ferocious attacks of Bahamut.