Daito armor set is fine since it doesn't take up weapon/armor drops and drops as essentially a bonus reward each time you beat the boss meaning you get 1 daito armor and 1 coda/weapon
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Moonfang-X7 does actually take up a drop. In every other dungeon the final boss offers double drops, but in Prophecy one of those drops is guaranteed to be Moonfang-X7 armor which isn't the best