The way of the primal beasts can only be selected by a "monster race."

The way of a primal beast is the path for when a monster has come to realize through his teachings in a civilized culture that he is not an evil force, a malicious creature, or a cursed spawn.

He has realized that his primary place in the world is to be a force of nature one to be lived with that if treated carefully and honored will only harm what will disturb it. You are a fire in the forest, if left uncapped will burn everything down, but however if you are treated well and calmly, you will only provide warmth and care.

Strength of the Beast

Starting at 3rd level whenever you make an unarmed attack or a natural attack such as a bite attack, add a second martial arts die to the damage.

Additionally you may spend 1 ki point as a bonus action to to produce a frightening aura in a 10ft radius of yourself. Each creature that makes an attack in the aura has to make a wisdom saving throw or must reduce the attack roll by 1d4. The aura lasts a number of rounds equal to half your monk level plus 1.

Alien Anatomy

Beginning at 6 level, whenever you down an enemy on your turn you may as an immediate action devour part of the enemy to heal yourself 1D8 points of damage. When you do this you may spend additional ki points to increase the healing by 1D8 per ki point spent.

Horde Breaker

Beginning at 11 level you're more primal powers have manifested giving you the ability to create a destructive shockwave emanating from yourself.

As an action you can spend 5 ki points to create a shockwave emanating from you in a 30 foot radius each creature must succeed a constitution saving throw or take 10d10 force damage and is knocked porne. On a successful save the creature will take half as much damage and in not knocked prone.

Serrated Skin

At 17th level, you're body starts to resemble your monstrous ancestry. You gain a permanent +1 to your ac and once per round when a creature would perform a melee attack against you the attacker takes damage equal to the damage dealt.