Rathlos Armor is the best to wear because no matter what armor you have a hit from a Fata will kill you, but with Rathlos Armor you will have great protection from the fire breath. And any Bow Gun that can use those one exloping ammo (I can't rember I have'nt played in a long time.) and make sure to bring all the stuff you need to make them. Enough well aimed hits should kill it.
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My dragon has issues
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WARNING: "Next left" does not mean "turn left immediately."