Purifier Ritual

Casting Time: 3 hours
Range: Self (30-foot radius)
Components: V, S, M (a consecrated flame taken from a sunlit altar)
Duration: 8 hours

You become a beacon of sanctified light. Allies within range gain resistance to necrotic damage, and undead have disadvantage on their first attack each turn against them. All magical darkness within the radius is dispelled. As long as you remain, the area remains bathed in divine daylight.