I figured I'd bump up this thread instead of making a new one, since this query pertains to the same character:
If he ever reaches level 18 (Dread Necromancer 8/Pale Master 10), my character will have many of the undead type immunities without actually being undead. Getting the Ghostly Visage familiar from Dread Necromancer makes him immune to mind-affecting effects, Pale Master 7 grants immunity to disease, non-lethal damage and stunning, and Pale Master 10 imparts immunity to poison, sleep effects, paralysis, death effects, critical hits, ability drain, and energy drain, as well as damage to his physical ability scores.
That leaves only the blanket immunity to effects that elicit a fortitude save, as well as having to eat/sleep/breathe. If the character could protect himself from those, he'd effectively be an undead with a constitution score (and without the undead type, which is means he can't be turned either).
Any tips on snagging those last two factors? I figure it'll probably be more viable to simply boost the fortitude save as much as possible if not going for necropolitan.