Astral Strike

As part of the action used to cast this spell, make a melee weapon attack against a creature within range. On a hit, the target suffers the attack's normal effect and a golden glowing star appears on the creature's wound. If the target is struck with another melee weapon attack within the duration, the attacker gains 1d6 temporary Hit Points and the spell ends. 

The spell's Temporary Hit Points gain increases by 1d6 at 5th, 11th and 17th levels.