Introductory module for the Hollow World setting. First Adventure in the Blood Brethren Trilogy. Into the Depths! Under the ruins of Barleycorn Monastery, a tunnel leads one thousand miles downward. Through it, a rescue mission into the Broken Lands turns much stranger. Much more Serious. For the trail leads to the Hollow World. Launch your D&D game players into fabulous lost-worlds adventure across the Hollow World! Travel the Azcan Empire. Explore the secret labyrinth of the Great Pyramid in Chitlacan. Fly to the core of the world and enter the Smoking Mirror, before the monstrous Prince Kano enacts his devastating scheme - a scheme called: Nightwail!