Dwarven Champion's Armor

There is another thread about those discoveries and there has been no notification as to whether they have even been released yet, although it is somewhat likely they have been.  However, I think that artwork has been around longer than Duraz Karag.

I crafted over 1000 Upland plate in one of my dwarvish towns in one go, and it did not unlock a discovery. If there is a set amount of armor necessary to craft before you can discover it, 1,000 is not it. I suspect I've made over 2,000 in this town, but I have not kept track. 

I think making one of each of the armors you can research could unlock it

I haven't sent a trader to a Dwarven hub, but I've researched most of the dwarven faction descriptions. I also spent a significant amount of effort trying scouts and spies in the area of Glinntre, investigating the backstory of Treggar's Crows. I didn't find anything of note there, but I've started a map on graph paper, and I'll be systematically hitting those squares of the coming weeks. I had high hopes I that would discover something cool in the Ancient Lair square located conspicuously near Glinntre.

I don't expect these efforts to bear fruit, however. There seems to be a great number of things implied in the faction descriptions that appear to be meta-game fluff, rather than something concrete that you can interact with in the game.

I am, however, holding out hope that we will eventually stumble upon something like the Human Statues Mystery, which was great fun to complete. I rather enjoyed scrolling all around the map looking for the rumored locations. I wish that quest would have lasted a lot longer.