Q: Dear Sage,
At 20th level, the beguiler (PHB II, 6) automatically overcomes the spell resistance of a foe denied its Dexterity bonus to AC. Does this allow him to overcome spell immunity as well?
A: Ah, the old irresistible force versus immovable object argument rears its head once again.
In this case, the Sage must come down on the side of the immovable object -- spell immunity trumps the beguiler’s class feature.
About the Author
The Sage is a mammal classified in the bear family, Ursidae, native to central and southern China. Debate continues as to whether he is truly a bear or more related to the raccoon rather than the bear, or perhaps in a family of his own. When not eating bamboo and answering rules questions, he works under the nom de plume of Andy Collins as an RPG developer in Wizards of the Coast R&D, where his development credits include Complete Mage, Dragon Magic, and the Player's Handbook v.3.5. He can be easily recognized by his large, distinctive black patches around the eyes, ears and on his rotund body.