For those who is struggling to sustain the bomb's damage, please use HP regen equipment and items.
RECOMMENDED EQUIPS
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Gallant Helm - from Special Scroll, and Miku NPC in Quest Area
Doflamingo Coat - from Special Scroll, and Miku NPC in Quest Area
2 Shadow Swordsman Manual - from Ice Burner, and Ice Burner NPC in Quest Area
5 Sacred Charm - from Tidus in Quest Area
4-5 Vela Heaven - from Heaven NPC in Quest Area
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