Viro Plasm is an attack used in Super Mario RPG: Legend of the Seven Stars. It is an unblockable attack which causes one target to become poisoned. While having the poison status, a character will gradually take damage until cured or downed. The effects of Viro Plasm can be negated with accessories that protect against poison. The name of the attack suggests that it can be performed using a poisonous substance. Viro Plasm can only be used by Ameboid.