Ok, I have this vampire (erf attached) that for such a strange way is not considered an undead by NWN and it seems I cant fit it. Since I have various creatures with the same problems, would someone help me?
If your problem is that the creature is not treated as undead for combat purposes, then you will need to add the basic undead properties skin/hide to the creatures inventory. This will provide the various undead immunities.
I also see that the creature has 40 levels of barbarian and 5 of undead. I’m not 100% but this could be problematic?
Anyway, you’ll want to give it undead props for sure.