[Path Magic] What happens if you Banish a Spirit of Place?

[Anthony]

Originally Posted by Plane

Horror by way of some features seems to imply that you define being able to be affected by these spells as a 0pt feature (even though it seems like all downsides so maybe it should be a quirk?).

What it really is is that GURPS treats classes of being as zero point feature: many abilities only work on specific classes of being, and you're immune to any abilities that don't work on your class of being. Whether this should be a net benefit or penalty is setting dependent so it should really be handled by unusual background (which should have a disadvantage form, but doesn't) rather than assigning a point value to class of being itself.