Turning right (for now) the PCs enter encounter area #18. The hallway is the same stone as before, but it is somehow darker. The hall is 20 feet wide and extends some 60 feet into deepening darkness.
Standing in the hall, seemingly waiting for the PCs is a small group of goblins.
The goblins are not waiting, but they are not surprised either. They have come up from the lower rooms to investigate the noise. There 1d4+4 goblins here. They are all 1-1 HD (4 hp each, or 1d6). They have shortswords, short bows, and wear leather armor.
If combat goes against them after the first round, one will flee down the hall to bring back reinforcements that arrive in 2d4 turns.