M. Ancient battlefield

The centerpiece of the aerie. About one hundred skeletons of elves. Remains of weapons, armor, and shields from another era, corroded. Some bear the emblem of the Black Spider, others that of the White Tree. The northern tunnel leads to the Bright Outside (a ravine sheltering a petrified forest). A muffled squeak followed by a loud, distant clack! can be heard coming from the west (N).