Melee Weapon Attack: +9 to hit, reach 5 ft. (10 ft. when Huge, 15 ft. when Gargantuan), one target. Hit: 12 (2d6 + 5) piercing damage, or 17 (4d6 +5) while enlarged to Huge, or 33 (8d6 +5) while enlarged to Gargantuan. If the target is a creature, it must succeed on a DC 13 Strength saving throw or be knocked prone. If the target is a creature and the fenrir rolls a 20 on the d20 for the attack roll, the target takes an extra 14 piercing damage, and the fenrir rolls another d20. On a roll of 20, it lops off one of the target's limbs, or some other part of its body if it is limbless. If the target is an object other than artifact, fenrir destroys a 1-foot cube of it.