Biter

You can add your proficiency bonus to your bite attacks and double their damage (roll extra dice). When biting a limb that is holding a weapon or other object the target must roll a Constitution saving throw with DC equal to 10 + Strength modifier + proficiency bonus, on a failed save the target loses hold of the object. Also when biting a limb if your roll to hit exceeds the target CON score by 5 or more you can amputate that limb (in this case the disarm is automatic) and the target takes 1 extra damage die (of the same kind of your attack) of bleed damage. If you bite a neck or throat and the damage you deal is more than half of the target maximum hp the creature drops to 0 hp instead.