Howling Caverns

The Howling Caverns were a network of tunnels beneath the Orsraun Mountains; by the late 10 century DR, they were mostly large enough even for the largest dragons to move in. By the late 14 century DR, they had collapsed.

Description
The labyrinth joined various meltwater caverns; wind constantly moaned through them, giving them their name.

History
In the late 10 century DR, Meldryn Jalensifer lured the Magister, a black dragon named Constulgrael, to the location with a rumor and ambushed him, slaying him and claiming the mantle of the Magister for himself.

By the late 14 century DR, the caverns had collapsed.

Rumors & Legends
To lure Constulgrael, Meldryn had spread the rumor of an ancient draconic crypt, belonging to a sorcerous dragon and full of spells unique to dragons. Some sources implied that the caverns may have in fact been dug by dragons.