Hey Nani, I bet you probably haven't thought about this much but I was wondering, when Sigyn takes the magic from others/stops it, does it go to her or is just kinda locked down until she releases it again?
In the most basic way- and not exactly best explanation I admit- is I think of her powers like a rechargeable battery. She’d have a base pool of her own power of course, and probably a limit of how much external magic she can store.
In my headcanon her magical abilities are FAR stronger when it comes to acting as an unleashing conduit or straight up fettering, so she focuses more on those aspects rather than just hording seidr lol
While she has control of a magical source tho, she can definitely use and manipulate it as if it were her own