I don’t disagree with Gnosis being training. I just feel like Anagogis should also be training. The Schools work basically the same way, and it’s not any quicker or easier to become an Anagogic sorcerer. It’s just more common because there are more Schools.
Until they are actually trained in one branch of sorcery or another, specifically until they have cast their first spell, the Few don’t have Marks and are able to handle chorae without harm. They can detect the Mark on others, though, without training. I can’t recall exactly how sorcerers identify the Few before they have marks; I can’t imagine it all relies on kids going up to sorcerers and going, “Hey mister, you look funny, what’s up with that?” and outing themselves. I’m also not sure if the chorae are particularly detectable to the Few before they become vulnerable.
Really, in the books Anagogis, Gnosis, and Psukhe would all be different skills that could only be taught to one of the Few. (Yes, Psukhe requires being one of the Few first, but Cishaurim then never develop Marks.) Psukhe training doesn’t happen before sorcery, Psukhe training is a type of sorcery with its own idiom (emotion), benefits (no Mark), and downsides (going blind, although that actually might be a religious practice rather than an inherent property of the Psukhe). I’m not even sure that they’re mutually exclusive; avoiding spoilers, it’s seems like there are some people who should have the means and inclination to learn different branches, but it doesn’t happen. On the other hand, I can’t imagine that there would be so much effort to steal Gnosis by Anagogics if they couldn’t actually use it.
Here’s how I’d rework it: make The Few a trait open to anyone, add more traits for training that go in the sorcerous LPs, and rename Sorcery depending on the practitioner to Gnosis, Anagogis, or Psûkhe.
Trait: The Few (1 pt)
You are capable of learning sorcery, and you can detect the Mark that remains on sorcerers and anything touched by sorcery.
Trait: Anagogic Training (4 pt)
Requires The Few. You are an initiate of one of the Anagogic Schools and can use the Sorcery skill. Add a 1D Affiliation to one of the Schools, or a 1D infamous reputation if you have become a wizard, unbound to any School. Your use of sorcery has left you with a Mark that can be perceived by any of the Few and a vulnerability to the chorae, whose touch will turn you instantly to salt.
Trait: Mandate Training (4 pt)
Requires The Few. You have been trained in the Gnosis by the Mandate and can use Sorcery. This art, superior to the Anagogis used by most Men, gives you +1D to all tests of sorcerous skills. Initiated through the ritual of the Grasping, you also experience dreams of your School’s founder, Seswatha. The unimaginable suffering experienced in those dreams protects you from any attempts to extract the secrets of the Gnosis by force, be it ordinary torture or use of the Cants of Torment. Your use of sorcery has left you with a Mark that can be perceived by any of the Few and a vulnerability to the chorae, whose touch will turn you instantly to salt. (Note: I got rid of the extra belief. It’s fine, but I think it’s fine to make Mandate Schoolmen take the Belief ordinarily. Or not, and be kind of lousy at the Mandate mission, at least until they run into Consult agents and take up the belief.)
Trait: Psûkhe Training (4 pt)
Requires The Few. You have been trained by the Cishaurim in their art, the Psûkhe, and can use Sorcery. This power, fueled by passion rather than intellectual understanding, is rooted in Will for you. Add a 1D Affiliation reflecting your standing among the priest-sorcerers of the Fanim. As a sign of your devotion you have put out your own eyes, but you are able to see through your art and the eyes of a snake that you keep with you as a symbol of office and a source of vision. The Psûkhe leaves no Mark, either on its practitioners or when spells are cast, so you cannot be perceived by the Few, but you share other sorcerers’ vulnerability to chorae: their touch turns you instantly to salt.