That one, I think, is clear enough. You can concentrate in innate magic, in which case you can use talents, but not spells, charms, or feats.
*Or*, you can join Selfrock, which lets you concentrate in *all* common magic. You can keep common spells, feats, talents, or charms, and pay the halved (concentrated) costs for any of them.
As I understand it, if you join Selfrock, you're concentrating on "inner world magic"--you can use any magic which originates in the inner world. Common magic, as I see it, comes from forces which may or may not be native to an Otherworld, but are currently manifest in the Inner World.
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