Evil's Eternal Foe

This spell protects against aberrations, celestials, elementals, fey, fiends, and the undead.

Choose any number of targets within range. Until the spell ends, creatures the targets are protected from have disadvantage on attack rolls against the targets. The targets also can't be charmed, frightened, or possessed by them. If the targets are already charmed, frightened, or possessed by such a creature, the targets have advantage on any new saving throw against the relevant effect.

Adapted from the AD&D 2nd edition book Faiths and Avatars.