Trap Jaw

Prerequisite: Gnoll, Strength 13 or higher

Your jaws lock like a deadly vice around your foes, making escape impossible. You gain the following benefit:

• When you use your action to attack with your bite and hit a creature, you can attempt to grappled the creature as part of the same action. While you have a creature grappled this way, you have advantage on attack rolls with your bite against that creature, but you can't use your bite against another creature.
• The first time in a turn you hit a creature grappled by you with a bite attack, you can force the grappled creature to succeed a Strength Saving Throw, or be knocked prone. The saving throw is equal to 8 + your Strength modifier + your proficiency bonus.