Greater Protective Nimbus

5th-level abjuration (illumination)

Casting Time: 1 action
Range: Self
Components: V, S, M (a transparent gemstone worth at least 50 gp)
Duration: 10 minutes

You wrap yourself in a powerful corona that sheds bright light in a 30-foot radius and dim light for an additional 30 feet. Until the spell ends, you have resistance to necrotic damage and radiant damage. You can end the spell early by using an action to dismiss it, which creates a blast of light in a 30-foot radius. The blast deals 4d8 radiant damage to each creature in the area while simultaneously healing yourself of an equal amount of damage.