Help With DIY Emerald Legion: the Immortal Do-Nothing

[Doctor Despair]

The only ways I know to resist an Initiate of Mystra Mailman delivering Transdimensional Searing Orbs of Fire while projecting an AMF over you are:
(1) Via the static planar trait.
(2) Via a Multi-headed Lernaen Lumi.
(3) Via body-swapping.

I guess orbs of fire still have to hit, so pumping miss chance can help, or somehow persisting a Delay Death could help, although if we're persisting Delay Death we don't need damage immunity, haha.

I guess that leaves being an actual troll with a different kind of regeneration, so as to convert the searing damage to nonlethal... which brings us back to an unwieldy amount of HD. :/

Edit: I guess a Ring of Spellturning would be handy for Searing Spell postmen, providing you have enough notice to activate it, or maybe some custom Ray Deflection item (I'm not a fan of custom items though...)