Meltdown is an enemy skill that acts similar to Self-Destruct, dealing damage equal to the user's current HP to the entire party, but killing the user. It is used by powerful bosses including Omega and Armstrong. The Complete Collection adds in the Death Machine in Golbez's Challenge Dungeon, who can also use Meltdown.
Meltdown is used by the Doll family of monsters, and is their version of a Bomb's Self-Destruct move. It deals Fire damage to all characters in a circular area centered on the Doll itself. It is not usable by player characters.
Self-KO. Deals area damage equal to own HP.
Meltdown appears with the same effects and learned by the same job except that it has no element and its accuracy is half the accuracy of a normal attack. It is learned from the Vajra for 350 AP.
Melting is a physical process that results in the phase transition of a substance from a solid to a liquid. Nuclear meltdown is an informal term for a severe nuclear reactor accident that results in core damage from overheating.