Magic Hammer (ability)

Magic Hammer is a Blue Magic spell that damages MP.

Final Fantasy V
Learnable by Blue Mages. Damages MP by 50%.

Final Fantasy VI
The spell Rasp has a similar effect in this game.

Final Fantasy VII
Magic Hammer is an Enemy Skill learned from the enemy Razor Weed. It sucks away 100 MP from a single enemy and gives it to the caster. However, since the cost of the attack is 3 MP, the actual number will be at most 97 MP gained. If the enemy has less than 100 MP, then the caster will only gain as much MP as the enemy has. The in-game description of the skill states that it absorbs MP from all opponents, but it can only target one enemy at a time.

Final Fantasy IX
Quina Quen can learn this from the Magic Vice. It inflicts a random amount of MP damage to one target.

Final Fantasy XI
Magic Hammer is light-elemental and the user gains MP equal to the amount of damage. Doesn't work on undead.

Final Fantasy Tactics Advance
Blue Mages learn from Red Cap. Robs target of MP.

Final Fantasy Tactics A2: Grimoire of the Rift
Called Magick Hammer to bring it in line with Ivalice Alliance spelling standards, it is learned from Baknamy-type enemies. Robs target of MP.