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The warded creatures are immune to the effects of one specified spell for every four levels you have. The Spells must be of 4th level or lower. The warded creatures effectively have unbeatable spell Resistance regarding the specified spell or Spells. Naturally, that Immunity doesn't protect the creatures from Spells for which spell Resistance doesn't apply. Spell immunity protects against Spells, spell-like effects of magic items, and innate Spell-Like Abilities of creatures. It does not protect against supernatural or Extraordinary Abilities, such as breath Weapons or gaze attacks.
Only a particular spell can be protected against, not a certain domain or school of Spells or a group of Spells that are similar in effect. A Creature can have only one spell immunity or greater spell immunity spell in effect on it at a time.