Elytheria's Star Shard Halo

Five motes of crystalized starlight appear and orbit the head of a creature you touch, which do so for the duration. The target is then healed for a number of d8s equal to the number of motes now orbiting its head. Additionally, while the motes orbit it, a 30 ft. Emanation of Bright Light originates from the target. Whenever the target is hit by a ranged or melee attack that is made within the Emanation, the attacker is dealt a number of d8s in radiant damage equal to the number of motes currently orbiting its head. Immediately after a creature is dealt radiant damage in this way, one mote dissipates.

The spell ends early once the last mote dissipates or if you cast the spell again.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the number of motes created increases by one for each slot level above 4th.