As an action, one willing creature you touch is protected against certain types of creatures: aberrations, celestials, elementals, fey, fiends, and undead.

The protection grants several benefits. Creatures of those types have disadvantage on attacks made against the target. The target also can’t be charmed, frightened, or possessed by them. If the target is already charmed, frightened, or possessed by such a creature, the target has advantage on any new saving throw against the relevant effect.

Augment

You can target one additional creature for each additional mana expended. The creatures must be within 5 meters of each other when you target them.