Valkyries Protection

You call upon ancient ancestors to protect your ally from an enemies.   As an action, a bright light comes from the eyes of your enemy and they must make a Wisdom save or take 1D8 radiant damage.  Choose 1 creature, till the end of the targets turn that creature is invisible to the target of this spell.  This effect ends if the target is attacked or touched by the invisible creature.  If the creature makes it save it takes 1/2 damage and is not affected by the secondary affect.

This can also be used as a Reaction when an ally takes damage from a creature.  The target must be the creature that harmed your ally.