The other biological-armor stripping spell, named in the same breath as a method for undressing a god.
The second example spell in Crawler Tin's 21st-edition Cookbook note on gods as Soul Armor. Any spell built to remove biological armor could, theoretically, remove the alien driver from a deity's body — invulnerability permitting. Tin's advice is that if you need a god to do your bidding, it may be in your best interest to shed it of its off-world influence first, since the aliens are quite unpredictable in their manner.
A theoretical god-stripping spell, filed away by Carl for a floor he has not reached.