Warlord beats Troll, Troll beats Elf, Elf beats Water Sprite, and basically everything else beats Enchanted Bunny.
The secret passage can be picked up and used in any room (you must be present in the room to use it there).
It may be used to create a passage to the safe room.
So you can even use it across solid walls?
I thought it could only be used across unpassable entry ways without steps.
If so, that is great!