Near the edge of a cliff lies the entrance of the lair. At first glance, there appears to be nothing there but a young apple tree. If you touch the tree, and your DNA is a match, the ground opens up, and an elevator appears. If you touch the tree, and your DNA is not a match, you will be electrocuted to death. Your body will drop into the dungeon so that the Brotherhood can see their most recent kill.
The entrance is both the cliff above the lair and the entrance room inside the lair. The room is dismal and empty.