The third hallway (or northern one) proves to be almost like the others except for at it's center you find a short hallway that lead to some narrow steps. It has been sealed in by sand a rock over time. "Probably how this place was accessed long ago." Tregin says.
And another sealed doorway straight across from the hall that has no visible latch, lock, or way to open. Gyrs doesn't find another plate to indicate a trap in this hall but he does discover more marks along the wall down at the far end that suggest it is possibly here somewhere, he starts stepping lightly after that.
Suddenly Tox vibrates and clicks his claws menacingly. Something is near, something that might not be friendly.
OCC: Tox isn't surprised how about the rest of you? Perception checks please.