Iocaste said that you had to eliminate one of the "three vices" from Atreia in order to receive the Sanctum Medal. Following her instructions, you eliminated one of the three: Brigade General Anuhart, Unstable Triroan, or Lord Lannok. When you took evidence of your feat to Iocaste, she advised you to fight against the vices repeatedly to pass the qualification test of the Miragent Holy Templars.