Angel In My Armor

Casting this spell imbues the armor of the spell caster with a Celestial aura of protection.  The armor will glow faintly, giving off dim light out to 10'.  The protective aura will cause 2d6 Radiant damage on a failed CON save to any creature who hits the spell caster with a melee attack.  A successful save avoids damage.  Any non-Celestial creature native to a plane other than the Material Plane makes this save at Disadvantage and a successful save still inflicts half damage.