A famed -or infamous- informal categorization listing swordsmen of unfathomable skill. Upon reaching an unknown pinnacle, they disappear from the world entirely. Those who find one tend to find them battered and damaged, standing sentry or meandering aimlessly like unshackled undead. They are more or less still sentient in this state, though they refuse to answer any questions and only request or offer a duel to the death in exchange for tutelage and/or gear.