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Communal protection from energy grants temporary Immunity to the type of energy you specify when you cast it (acid, cold, electricity, fire, or sonic). Once the spell absorbs 12 points of energy Damage per Caster Level (maximum 120 points) for a subject, the spell's effects end for that subject.
Communal protection from energy overlaps (and does not stack with) Resist Energy. If a character is warded by protection from energy and Resist Energy, the protection spell absorbs damage until its power is exhausted.