Well, he's probably going to have picked up that some of these non-human guests have some ability to sense him, because they're going to corner him/Stone at some point. Not sure how that's gonna fall out yet. I need to set it up (tomorrow prolly, ran out of time today). Most likely Stone is gonna get dead and the shade jumps to Casper in the process, but not sure what all transpires to make it happen.

Is there anything that CAN kill or contain the shade, besides Shadwell's ritual magic?