Well, you might as well just disregard my post and I'll start again if the spell simply doesn't work that way. Probably it'll be several degrees of unimpressiveness given the party's saves, but I should be used to that by now. Give me a few days and I'll come up with something else. As for how Ragnar didn't see the demon: because True Seeing doesn't allow him to see through walls or around corners. Ragnar did not roll Perception, so he didn't have a chance to spot it.