The Ultima Weapon Petrify bug refers to a bug in Final Fantasy VI involving the Ultima Weapon sword and the status Petrify. Normally, a petrified character cannot be damaged but whenever a player has a character equipped with the Ultima Weapon, the character can still attack a petrified character for 1 HP worth of damage. If the petrified character is reduced to 0 HP from this, they die like normal. There is a bugfix patch that players can use to fix this on the SNES version (it's called "Carve Stone bugfix" on that page).

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