These trollbane acorns, once thrown, a target creature must succeed on a DC 10 Constitution saving throw. On a failed save, a target begins to turn to stone and is Restrained. The Restrained target must repeat the saving throw at the end of its next turn. On a success, the effect ends on the target. On a failure, the target is Petrified until freed by the Greater Restoration spell or other magic. It has six charges.