Aphotic Shield

You summon a barrier of pure magic around a target that you can see within 30 ft of you for one minuet. The target gains 1d8 temporary hitpoints, once when the spell ends or when you end concertation on the spell willingly, the barrier explodes. creatures within 5 feet of the target must succeed a dexterity saving throw or take 1d8 points of force damage, target included or half as much on a success.