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depends on the game

If you mean in Final Fantasy, it is an optional side quest. You must visit Bahamut on the Cardian Islands and go through the Citadel of Trials, a bonus dungeon. In there, you'll find a rat's tail. Bring that back to Bahamut, and he will upgrade your classes.  Primarch Dysley FFXIII - Sprite-Dysley 05:43, April 3, 2013 (UTC)

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