Originally Posted by
TheMadLinguist
Technically, they don't say "can be mentally damaged". They just say "cannot be physically damaged". So if you found a way to get a con score, you'd still be immune to physical damage, or if you found a way to count as the undead type, you'd be immune to physical but not mental damage.
Or if you lost your con as a non undead, you'd be immune to any ability damage.
Unless you have rulestext that says "undead lose any immunity to ability damage to their mental scores"?