Scanbo.A flashback shows Professor Anders tutoring Percy and Cassandra on the powers of residuum - a mineral which can enhance arcane powers and is refined from whitestone rocks. The children witness an argument between Anders and their parents as they deny his request for a residuum refinery. Having rescued Archibald in the present, Vox Machina return to a resistance basement hideout. Vax, Vex and Scanlan confront Percy about pointing his pistol at allies during the prison break. Percy explains how the plans for his pepperbox pistol came to him in a revenge-fueled dream...