Pact Bond. Add your Proficiency Bonus to any ability check or saving throw the vestige makes.
Vestige's Strike. Melee or Ranged Attack Roll: Bonus equals your spell attack modifier, reach 5 ft. or range 60 ft. Hit:1d6 + 3 plus your Charisma modifier Fire (Fiend), Necrotic (Undead), or Radiant (Celestial) damage.
Divine Power (1/Day). Your vestige manifests a remnant of its divine power in one of the following ways, based on its form:
Cursed Invocation (Undead Only).
The vestige places a curse on a creature you can see within 30 feet of the vestige for 1 minute. While cursed, the target has Disadvantage on attack rolls against you and the vestige.
Fiendish Swap (Fiend Only).
If you and the vestige are within 60 feet of each other, you both teleport, swapping places.
Healing Touch (Celestial Only).
The vestige touches another creature. The target regains Hit Points equal to 2d8 plus your Charisma modifier and ends one condition on it: Blinded, Deafened, or Poisoned.