For the loot phase I think I got a pretty good [url=https://www.roleplayerguild.com/rolls/20953]4 and 6[/url]!

As for the lock and trap, I still vote Pitfall Trap, ideally near the Mine Shaft. I don't know how exactly the physics of it works but in my mental scape any adventurer who goes to the mine shaft may have an unfortunate chance to take an express gravity method of reaching the bottom when a support beam "happens" to give out. As for the lock, I'm good with whatever but could it possibly be a lock that would keep adventurers [i]in[/i] the maze once they enter? For example, going through the opening tunnel and then into the maze is easy, but once they enter they're barred from the other side. Messes with them psychologically because now they'll think "the only way out is forward".