[D&D 3.5 PrC Variant] Necromantic Alienist
ALIENIST VARIANT: NECROMANTIC ALIENIST
Familiar Abilities: This functions identically to the standard alienist's class feature by the same name, except it may be used to advance any one of the following class features instead of advancing a familiar: Skeletal Minion, Rebuke Undead, Undead Minion.
Warp Undead: Whenever a necromantic alienist would use any spell that would create or summon an undead creature,she automatically applies the pseudonatural template to that creature. For example, by casting summon undead IV, she could summon a pseudonatural allip. This adds the pseudonatural template to the allip.
A necromantic alienist gives up the ability to create standard undead. This replaces the standard alienist's summon alien class feature.
Pseudonatural Familiar: This functions identically to the standard alienist's class feature by the same name, except that it can be applied to what ever they choose to apply their familiar advancement instead. If they choose to advance rebuke undead, they may now rebuke creatures that are considered native to the far-realm.
Extra Necromancy: From 6th level on, a necromantic alienist gains one extra spell slot at her highest spell level. This slot can be used only for spells that create or summon undead creatures.
This replaces the alienist's extra summoning.
Just a variant that came to mind. Not sure if it is any good, but here it is.