[maximara]

Originally Posted by hal

So, what precisely is it, that magery is - where you can "Improve" it through use? If it is simple knowledge - that doesn't belong in the "Advantage" aspect, but in the "Skill" aspect. If it is an inherent "raw power" - that doesn't much make sense because Magery isn't used to power spells - fatigue or energy reserves (Magic only) are used to power spells (when not using power stones that is or gaining extra energy via the spell "Lend Energy").

Two things here;

1) Having a skill as advantage is what happened with Languages, In Classic each language was a skill but in 4e it is an advantage. So instead of English-15 one has English (Native). Similarly Eidetic Memory can be learned as well as being inborn. (It is expressly stated this is the case)

2) Magery is a talent and GURPS has two types of talents inborn and learned. The issue with Magery is the (Functions as a Different Talent ±0%) enchantment/limitation so there are forms that are inborn and other learned such as via Fractional Magery.