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The use of generalized magic is a talent. Like with most talents, it is not predictably heritable but does tend to run in family lines.
The largest difference this has with other talents is that it is much more externalized and general-purpose. Other talents that have external effects, (ex: Healing) have very specialized uses. Other talents that are general-purpose (ex: Luck) are either not consciously controllable or largely internal.
When you looked at the vision of yourself and saw the power coursing through it, you wondered whether it might be for healing or for divining or for any number of things. The answer is "yes." The power is there for all that, and for abilities you have not even imagined.
-- Virim in Wolf's Blood, Chapter 16
What I am saying—and not all my kin agree—is that where blood is involved, there is no difference between sorcery and prayer. The rituals involved may be called prayer, but they are sorcery. I think one grew from the other.
-- Questioner in Wolf Captured, Chapter 39