[Kameron8]

The Certain Defeat status is supposed to set a target's HP to 0 at the start of the round, to keep them down if they get healed. Magical Nova's potential can inflict this status -- however, when a target has this status, it will never do anything. They will never be reduced back to 0 HP; it's as if Certain Defeat (the status) doesn't do anything at all.