| Well, being immune to polymorph does not give you immunity to transmutation effects period. However, he may have a prestige class that actually states he is immune to transmutation effects. Master of Many Forms, the prestige class from Complete Adventurer is such an example. Even though the class focuses entirely around shapeshifting, you gain immunity to "transmutation" as stated by the 10th level ability.
So if it's a PrC, you might want to check this. Otherwise, he is not immune to disentegration. |