Divine Blade

Upon casting Divine Radiance Blade, the caster summons a magnificent longsword composed of pure, radiant energy.  When the caster hits with a melee attack using this sword, it deals 10d8 radiant damage. This damage is a reflection of the sword's divine origin, making it particularly effective against creatures vulnerable to radiant energy. The sword radiates a divine aura in a 10-foot radius. Any fiend or undead creature that enters the aura for the first time on a turn or starts its turn in the aura takes 2d8 radiant damage.