[bsftcs]

One of the hints given in the Valeia tavern is, that only enchanted steel will inflict damage on ghosts and spectres. And so far as I remember enchanted weapons are the only ones low level parties can use to hit Rumphy and the tainted spectres in the crypt. I have never tried killing them with a high level party using non-enchanted weapons, so it could be that most spectres require enchanted weapons to take damage.