Transmuting Smite

The next time you hit a creature with a weapon attack before this spell ends, your weapon sparks with a golden energy, and the attack deals an extra 5d10 bludgeoning damage to the target. Additionally, the target must make a constitution saving throw. The spell can create 3 levels of petrification. At 1 level, the creatures movement is halved. At 2 levels, the creature has disadvantage on all attack roles and saving throws. At 3 levels, the creature is completely petrified and cannot repeat the save for 1 minute. On a passed save, the creature gains 1 level of petrification. On a failed save, the creature gains 2 levels. At the end of each of the target creatures turns, they repeat this saving throw and either gain 1 more level on a fail, or lose 1 level on a pass. The spell ends when the creature reaches 0 levels of petrification.