Vox Machina explores an ancient temple to search for their first Vestige of Divergence, a legendary weapon they hope will aid them against the dragons of the Chroma Conclave. As they overcome a series of dangerous encounters to reach the sunken tomb, one of the team makes a terrible mistake.

As the black dragon Umbrasyl escapes their attempted ambush, Vox Machina pursues him to Gatshadow Mountain. In the fearsome acid-filled tunnels of Umbrasyl’s lair, Vox Machina must make a final stand against the evil dragon.