[Bishop Edward]

Also pale master is severely underwhelming due to losing caster level, and only useful in 40 level power builds, though retaining full progression would create the opposite problem of why NOT take it.

One of their major features in PnP not featured in NWN is that they get 0% Arcane Spell Failure when casting in Undead Armor: Zombie Hide, Skeletal Breastplate, Death Knight Plate, etc... these would be very easy to implement in the server: 0% ASF armors with bone/rotting flesh appearances, with "Class Restriction Use Only: Palemaster" and to balance the heavier armors would be more pricey/higher level requirement/more rare (source: 3.5's Libris Mortis)