Celestial Mitosis

You divide a portion of your body into a luminous duplicate formed from astral slime and starlight.

The duplicate appears in an unoccupied space within 5 feet of you.

The duplicate has:

AC equal to your spell save DC
Hit points equal to twice your cleric level
Immunity to poison and psychic damage

 While the duplicate exists: When you cast a healing spell, you may originate the spell from either yourself or the duplicate.
When a creature receives healing from one of your spells, it gains an additional 1d8 hit points.

When the duplicate is reduced to 0 hit points, it bursts into radiant cosmic matter. Creatures of your choice within 10 feet regain 2d8 hit points.