Darkness Before Dawn

Publisher's blurb: The dwarven city of Valhaspar is under siege by an army of demons. Race against the coming dawn to confront the demonic general and attempt to close the gate, or assist the dwarves with a desperate ritual, deal with a dragon, and sink the demon army into the depths of the earth. A 3-hour adventure for characters 12th level and higher that can be run as a stand-alone or in conjunction with material from Out of the Abyss.