This is now rogue only. One of everyone's favorite scenarios is back. If you take the 2nd tier research called the Vault you can get treasures from noggenfogger's vault including keys (hanging on one of the walls, use find treasure on outlaw to see it. It's small) which when you loot you get 3 (at least for me) keys to run the scenario!
Oh, and the sub hidden artifact appearance is occasionally in one of the finale chests (took me 5 chests to get it)