So, I'm not sure what you have to do to unlock the last level of this, but I've had the adventuring tree complete for quite a while.  Sometimes after researching the next dungeon tech (Not heroes or resources) new locations show up but my notable location level remains the same.  I'm not sure if you have to raise it another way, but I couldn't seem to find anything that let me do it.  My sovereign is lvl8, I believe, and he does all the adventuring. (with a party of soldiers, summons, and a dragon)  Anyone else able to access these?

On a side note, Doing the second part of the anvil quest gave me no anvil pieces and didn't mention where the next location would be.  My inventory had a lot of items in it so maybe it was full (not sure about the limit, too many midnight stones and destiny slivers).  Also did the quest with the floating set of armor and received no reward (said it didn't fit and I could sell it...but got nothing in my inventory.)

Edit: So The anvil quest not working was solved by selling my inventory. (Not my precious Midnight stones!)  It worked just fine when I went back and redid it with a smaller inventory.  I presume that this was the issue with the armor as well.  A little indication would be nice so I don't lose a fragment of the forge again.