Talk:Secrets and collectibles/@comment-29150576-20170308172132/@comment-2A02:C7D:4A4D:1A00:2D83:79E5:D5CC:24AF-20171017162835

No idea, but it's heavily hinted ingame that they will eventually have a use, Wynne decribes them as "having a useful bit of power in each of them". My guess is if we ever get Ginasta into the Harem, that they will become a core part of getting her unique gear, maybe you will need to collect the powers of the individual blades into one weapon for her use, with the end weapon quality increasing in relevance to how many we have gotten.

Shining swords collected < say 30, Weapon 1

Shining swords collected 30, Weapon 2

Shining swords >50, Weapon 3 (the most powerful variant)