On the second day of Hogswatch, your Seanan gave away...

My superpower is library clairvoyance. Give me time to attune to/authority over a collection of materials (usually a library), and I can pinpoint where everything is located, whether it's actually present at the time or not, and go from title to complete description, minimal description to title, or between any other descriptors that pop up in Dublin Core.

The strength, logically enough, is full understanding in specific quarters--if I have a space and/or a collection, I know where everything is, including the things that should be there and aren't. Good for finding stolen objects, say, or grabbing the right potential improvised weapon rather than something that won't work near as well, and if teamed up with someone who can use the objects in whatever collection I'm attuning to... well. Not quite so good against someone with combat-related powers, though, and since it requires collections, it doesn't work as well for unique things that were never made part of a set, or parts of a set that aren't associated with a place (possible upgrade? Worth considering from a dramatic standpoint). I could see it potentially being used on organizations of people, though I imagine that would be much more taxing and require getting over half a dozen mental blocks--good for an Eleventh Hour Superpower, not likely to figure into any fight stemming from this contest.