I have been prepping and converting Tomb of horrors for some friends come this halloween. So the list at the end got me thinking specifically the power word kill pronounced by an Æthereal magic user. So is the Demi lich residing in the ethereal and this is what makes him vulnerable? should this type of thing extend to other spells? just to use the list from the original adventure holy word seems like a prime candidate to be more effective if the caster was also Æthereal. Would this type of thinking extend to other undead, not skeletons or zombies but some of the incorporeal undead ? Just some rambling thoughts and questions. Wanted to hear what others thought.