[@addamas] You're solid, get em over.

[@Ithradine] Magical Affinities are determined essentially at birth. They are a fundamental aspect of the Soul, which the Gate is apart of, so it's not really possible to change an Affinity, nor is it possible for an Affinity to be "hidden" - a person with the ability to check your Affinity will see all the ones you possess, pretty much no matter what. In the same vein, you don't exactly "unlock" your Affinity, since it's with you from birth, you just learn how to use your Gate and cast magic. What you're born with is what you get, and there's no way to change that, outside of some exceptional methods that I won't mention yet.