Battle Trumpet is the third-strongest weapon for Cait Sith, being beaten by the Starlight Phone and HP Shout. It provides 95 Attack and Atk%, Critical% +2, and has three linked materia slots with normal growth. It can only be found in the Junon Underwater Reactor at the Submarine Docks.
War Trumpet is a low-ranked instrument that provides 25 Attack and 2 Evasion, and teaches Wolf to the Beastmaster for 150 AP and Catnip to the Animist for 200 AP. It can be obtained from the Bazaar through the Ill-tuned Instruments D pack.
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