Play Chaos In Kyoto. To obtain the Mastery & Vision (Iwasaku Iwatsutsu), defeat Ieyasu Tokugawa before he retreats. Ride up there and swat him. A supply team will sprint from a gate along the east side, moving south. Pick up the weapon and complete the stage normally by allowing Hideyori Toyotomi to reach the escape point on the east side, then defeat Kojirou Sasaki when he appears.