Cursed Technique, Cursed Spirit Manipulation

Cursed Spirit Manipulation Technique: You have the
unique ability to absorb and control non-humanoid
creatures that you have previously defeated,
bending them to your will.

Foe Domination: As an action, you can attempt to
dominate a creature within 30 feet of you that has
less than 10% of its maximum hit points. The target
must make a Charisma saving throw (DC equal to 8
+ your proficiency bonus + your Charisma modifier).
On a failed save, the creature is transformed into a
small crystal orb. You can have a number of orbs
equal to your Charisma modifier.

• Summon Manipulation: You can release a
  dominated foe from an orb as a bonus action,
  allowing it to act under your command for 1
  minute, or until its HP drops to zero. At the end
  of the minute, the creature reverts back to an orb.

• Overpowering Absorption If the dominated
  creature's challenge rating is less than half your
  level, you can absorb it with no consequences.
  Otherwise, you must make a Constitution saving
  throw (DC 10+ the creatures challenge rating).
  On a failed save, you suffer one level of
  exhaustion.

• Orb Absorption As an action, you can consume an
  orb to gain temporary hit points equal to the
  absorbed creature's Hit Dice plus your Charisma
  modifier.

• Orb Amplification As an action, you can consume
  an orb to empower your attacks. For the next
  minute, your weapon attacks deal an additional
  1d6 necrotic damage.