Eclipse Shield

Your body darkens as nuclear flames wreathe your body for the duration, shedding bright light in a 20-foot radius and dim light for an additional 20 feet. You can end the spell early by using an action to dismiss it.

The flames provide you with a coronal shield which grants you resistance to cold damage. In addition, whenever a creature within 5 feet of you hits you with a melee attack, the shield erupts with flaming plasma and the attacker takes 2d8 radiant damage.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d8 for each slot level above 4th.