Ancient Sentinel

You become a master of the ancient arts, gaining the following benefits:

• Your Wisdom score increases by 1, to a maximum of 30.
• You can use your wild shape without expending a bonus action.
• You gain the ability to summon the age-old guardians of the wild to temporarily empower your attacks. Whenever you roll a natural 20 on an attack roll, you can use your bonus action to summon the aid of an animal spirit to instantly kill the foe. If this happens, it would have the same effects of a vorpal sword on the creature, all damage being the same as the base attack's. After you use this ability, you can't use it until the next dawn.