Astral Seal

As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell's range, otherwise the spell fails. On a hit, the target suffers the attack's normal effects, and glowing Seal appears where the target was hit and lasts till the beginning of the caster's next turn. If the target is struck by a melee weapon attack before then by an ally, the ally gains 1d6 temporary hit points, and the spell ends.

This spell's damage increases when you reach higher levels. At 5th level, the melee attack  deals an extra 1d8 radiant damage, and the temporary hit points from the seal being triggered increases to 2d6. Both damage rolls increase by 1 dice at 11th level and 17th level.