So it's a collectable, it's stackable but it's lore, and it dropped in regular Dreadspire Keep. Apparently I've already collected it, but there is no link to the collection set to find out. DoDH was pre-collectables. So what is it all about? Ball of silk from Mistmoore's children also drops from the Hive, and shares the same attributes as the above item.
https://special.eqresource.com/piecesispieces.php Both of those are for the 19th anniversary quest Pieces is Pieces.