I have been deliberately avoiding killing rats until I found the special secret door in one of the first rooms off of the entrance to the central first level of Undermountain. I'm talking about the room with Drow and Duergar, where the secret door only appears when a rat wanders close enough to the corner of the room. No, the rat didn't get killed by AOE during combat; the rat just isn't there at all, anywhere on the whole level! If I try to spawn a rat in, it only spawns a summoned rat, which will not work. Is there a simple way to "cheat" a rat in to reveal the door to the secret room?