Non-elemental damage + make enemy Vit 0.
Meltdown is an indirect magic spell in Final Fantasy VIII. The spell reduces an enemy's Vitality and Spirit to 0, effectively removing their defense to both physical and magical attacks, and making them much more vulnerable. It can also be be junctioned to boost stats, and provides the third-greatest boost to Vitality. Despite its effect, Meltdown is not associated with any status effect for status junctions.
Meltdown is a rare spell that can only be drawn from high-level enemies when the party is over level 30. It is more easily refined from Mystery Fluids using the Guardian Force Diablos' ability ST Mag-RF. These are easily obtained from Gaylas and their cards.
Meltdown inflicts the Vit 0 status effect, which reduces a target's Vitality and Spirit to 0 and deals a small amount of non-elemental damage. This status cannot be attached to physical attacks with ST-ATK-J junctions. Vit 0 effectively removes the target's physical and magical defense, making enemies much easier to defeat. This is particularly useful against defensive enemies such as the Adamantoise.
Meltdown can also be junctioned to boost stats, notably Vitality, for which it provides the third-greatest boost to the stat. However, as the spell is not associated with any status effect, it is not possible to junction it to ST-Atk-J, meaning it is impossible to inflict its effect without casting the spell. Therefore, the player may wish to cast rather than to junction it, although the effect can also be gained by summoning Doomtrain. It is good to use against bosses.
Elite Soldier, Sorceress (B), and the final boss use the spell against the player party. The player can't fend against the status with junctions (other than with the Ribbon), but the spell itself can be reflected.