I can’t remember, did we ever find out what these was for in TSW? We assumed some sort of gear upgrade, but did we get there with the L11 gear?
Tilty once confirmed on a stream that the items were meant to be used in a quest chain to earn Third Age weapons. The only part of that that made it into the game were the weapon skins we got as loyalty rewards (and sadly didn’t transfer to SWL).
(Okay, technically, Andy said Tilty said it.)