Way of Bone

Bone Shard At 3rd level, you learn to create lethal shards of bone with which to strike down your enemies. When you would draw a weapon, you can instead extrude an osseous shard from your body, which detaches into your grasp. This shards is treated as a dagger.
  Marrow Storm Immediately after you take the Attack action on your turn, you can spend 1 ki point to make a number of thrown weapon strikes equal to your proficiency bonus as a bonus action. If you would make an attack using this feature and you have no weapon drawn, you may draw one reflexively for no cost.
  sharper shards Starting at 6th level, your bone shards count as magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage, and their damage is increased in line with the damage dealt by your unarmed strikes.
  Exoskeleton At 11th level, you can push your skeleton outside your body, forming a bony cage around your vulnerable insides. Your armor class increases to 19 unless it was already higher, and you are immune to critical hits. You can activate and end this effect as an action.
  Eternal Life At 17th level, you can rid yourself entirely of your flesh based vulnerabilities, investing your soul entirely in your skeleton. Your flesh and organs fall away from your body, and you gain the benefits of your exoskeleton permanently. In addition, you can no longer die of old age.