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The first level of summons (Chocobo, Sylph, and Remora) can be bought in shops at any point. Titan and Ifrit are mandatory bosses you must defeat to continue, so you can't miss them. Shiva and Ramuh are optional bosses that become unavailable after World 1. Carbuncle, Golem, and Catoblepas are only available in World 2, and in World 3, you can get Odin, Leviathan, Phoenix, Syldra, and Bahamut.

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