Certamen (Care-TAH-men, Latin for "duel") is the ceremony by which two magi conduct a magical duel. It serves as a non-lethal way for one magus to establish dominance and precedence over another with formal restrictions to keep it from disrupting the unity of the Order. Certamen can be used to settle almost any dispute, and the result of the duel is binding. Certamen can never be used to over-rule the will of a Tribunal or require a magus to overlook the Code of Hermes. Among famous duelists, Agrippina (nicknamed Nemesis) is especially noteworthy.