Enter the caves in the ravine at (H-7) (by the Ephemere). The ramp that leads down to the entrance is on the South side of the ravine, right next to the lake. About halfway down the ramp, you will see a path diverging West. This is the entrance to Ordelle's Caves
Once inside Ordelle's Caves, follow the right tunnel (stay SW path upon entering) in until you get to a room with Fly Agaric (Funguar). These fungar do not aggro, but will link if you attack them.
Take the tunnel from that room leading south and follow this path up some 'stairs'.
At the top of the stairs is your destination. There are 2 ??? in this room connected with this quest.