Was it September 2009 when Threnal was released?
I've been taking another character through every quest again to check some numbers for my quest log and I was left wondering why Threnal has never had any explorers added.
Rares I'm not so fussed about, although sticking high XP rares in the 4 "non-quests" dotted around the place wouldn't be a bad idea I suppose.
But we can't unlock the wilderness area map as we can with other wilderness areas.
It's only taken me 4 years to ponder this