Primal Meditation
One way or another you've become attuned to an element, at 3rd level choose between Acid, Poison, Cold, Fire, Lightning, Thunder, Radiant, or Necrotic. You gain the elemental affinity with your selected element. Additionally you gain the following Resolve Action.
Elemental Storm: When you hit with a weapon attack you may spend up to Three Resolve. For each Resolve spent you deal an additional die of damage and all damage done by your attack is changed to the element you selected in Primal Meditation.
Natural Absorption
You've become extremely accustomed to your chosen element. At level 6 you gain resistance to the damage type selected in Primal Meditation. If you would ever take damage of the same type as your chosen element from an enemy creature, you may either expend a number of Hit die up to half your proficiency bonus and recover that much hp, or deal that much extra damage of your chosen element on your next attack.
Second Nature
At level 13 the elements have become part of you. Choose one of the following benefits. This choice cannot be changed at later levels.
Infused Strikes: Weapon attacks you make can always be of their normal damage type, or of your chosen element. Additionally your weapon attacks deal an additional die of damage.
Second Affinity: You gain a second affinity of your choice that you did not previously select from the Primal Meditation feature. At level 17 you gain a third.
Eye of the Storm
You are able to channel your element in a storm around you. When your Imbuement resolve action is active enemies that start their turn or move within 15 ft of you take unreduceable damage equal to your proficiency bonus of your chosen element. Once per turn when you hit with a weapon attack you may deal unreduceable damage of your chosen element equal to your weapon attack's ability modifier to a creature adjacent to the target.