A distinction could also be made as to what variant of the spell/ability you have gotten through it's name. ei: Receiving a "Powerful Direct Damage" version of a spell from NPC Wilven would give your character "Wilven's Searing Blaze". Receiving a "Weakened Damage Over Time / Mitigation Debuff" variant from NPC Valhal would train your character in the use of "Valhal's Crippling Blaze". I'm sure some incredibly imaginative ideas from others could help flesh out this rough concept.