Body of the Sun

Your body emits light and heat that burns those who draw too close. While the spell lasts, you emit bright light in a 20-foot radius and dim light in a 40-foot radius. Any creature that starts its turn within 5 feet of you, approaches within 5 feet of you on its turn, or hits you with a melee attack while within 5 feet of you takes 2d4 radiant damage. A successful Constitution saving throw reduces this damage by half.

Using a Higher-Level Spell Slot. The damage increases by 1d4 per spell slot level above 2nd.

Adapted from Complete Divine (3e).