Multiattack. The gray render makes one Bite attack and two Claw attacks.

Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 17 (2d12 + 4) piercing damage. If the target is Medium or smaller, the target must succeed on a DC 16 Strength saving throw or be knocked prone.

Claw. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 13 (2d8 + 4) slashing damage, plus 10 (3d6) bludgeoning damage if the target is prone.

Bloody Rampage. When the gray render takes damage, it makes one Claw attack against a random creature within its reach, other than its master.