Lifebreak

Lifebreak, also known as Revenge and ????, is an ability that does damage equal to maximum HP minus current HP.

Final Fantasy V
???? is a blue magic spell.

Final Fantasy VI
Strago Magus uses the Revenge Lore.

Final Fantasy VII
???? is an enemy skill.

Final Fantasy IX
Steiner can use Minus Strike.

Final Fantasy Tactics
Ultima Demons can cast Lifebreak. Cloud's Blade Beam Limit also acts similarly.

Final Fantasy Tactics Advance
Templars can use Lifebreak.'