And there aren't any spells (core) that reduce or remove a creature's DR. Greater magic weapon gives one weapon (or 50 arrows) the ability to bypass DR, assuming the caster is high enough level. Which is great for whoever is using that weapon, but doesn't do much good for the rest of the party.Pants said:True, but when a level 9 PC can completely ignore the defenses of a CR 18 creature with a 3rd level spell, it ceases to be damage reduction and becomes a nuissance.
There aren't any spells (Core) that reduce (or remove) a creature's SR, reduce its resistance to energy, or remove its immunities.