So, I have 20 minutes (and need a shower) and no books, and I want to know if damage reduction is affected by antimagic fields. I'm guessing no, but that would make my Balor, with access to this spell, all-mighty, no?
In the SRD, Damage reduction is specified as Supernatural, so an Anti-magic field WOULD affect it. THe only thing unaffected by AMF's are Extraordinary Abilities.