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Yeah, I actually didn't think about that; spellpower isn't really needed for Darkness and Light... So, we can basically apply the unused scheme of attack/defense + spellpower. Or knowledge + attack/defense. If we go with the first scheme, there will be a problem with knowledge, but we can definitely come up with an ability that somehow compensates for it (like a Dark Ritual for the Academy or Spiritual Bond for Necropolis).
Lock, you're really pushing it with the "magicalness"!))) You can create words in a similar way, for example, "silost" or "ataknost," etc. :) If we're going to introduce it, it should be within the framework of a racial ability, and the name should be more solid. But in principle, if we're going to introduce a new school of magic, we can add this as an analogue to witchcraft, but only for their own magic.