Astral Seal

A flash of silver light streaks toward a creature of your choice you can see within range. Make a ranged spell attack against the target. On a hit, the target suffers 1d6 radiant damage, and you outline your enemy with the silver glow of the Astral Plane, exuding an energizing light that may aid an ally.

The next time an ally hits the target with an attack roll before the end of your next turn, that ally gains temporary hit points equal to half the radiant damage you inflicted on the target. Objects and creatures with 0 hit points do not grant temporary hit points from this spell when they are struck.

This spell's damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).