Deep Magic Volume 2 (p.240)
Zone of Radiance
5-level Abjuration
Casting Time: 1 reaction, which you take when you or a friendly creature you can see within 30 feet of you is targeted by an attack, spell, or other effect that causes a disease or deals necrotic damage
Range/Area: Self (30 ft. radius sphere)
Components: Verbal, Somatic
Duration: 1 round
Damage/Effect: Buff
Your radiant magic blankets you and your allies, preventing corruption and rot. Each friendly creature of your choice within 30 feet of you has resistance to necrotic damage and is immune to disease until the end of your next turn. You gain temporary hit points equal to 10 plus twice the number of creatures affected by this spell. The temporary hit points last until you finish a short rest.
Available for: Cleric, Paladin