Not that Bel understands some of that, but he thinks he has the basics. Astropath is obviously some kind of magic user specializing in long-distance communication, and Chapter Master is someone higher ranking. A part of him also can't help but notice 'warp' is one component of woven cloth, so the talk of magic even fits the same conception.

"What are the signs of possession? The main sort of mental abilities I've seen required the target be in the room with the caster, so it was pretty fucking obvious, even to someone who is not an expert."

It didn't hurt that the two beings he'd seen use it were a vampire and an illithid, which were pretty obviously in the 'not human any more, will mess with your head because your kind are livestock to them' category.