The area directly beneath the secret door is a stairway that leads into darkness. Whomever recently passed this way did not leave any torches or wall sconces lit. The stairway is wide enough that two of you may pass at a time, but you could choose to descend in single-file fashion, if you choose. The stairs lead down to a landing and then descend further to the subterranean level.
When you reach the landing, several of you (without needing to roll) can hear the sounds of GNOLLS grunting and barking in their peculiar language - Darwin can understand them (see below). From the sounds, you would estimate that there are probably half a dozen of them down here, somewhere in the dark.
How do you proceed?
[sblock=Gnollish, Darwin]"The Master said that the map part is down here!" one of them says.
"No, we cannot find anything!" another replies.
"Keep looking!" the first one says. "The Master will have us flayed alive if we do not come back with the map."[/sblock]