Returning to the Scarlet Monastery, the final two wings offer a few unique fights that build on Doan's, in that they require more strategy than button mashing, and from this point forward, most boss fights will throw in a wrinkle or two that will require some attention, or they might get out of hand.
The Armory begins outside in the training grounds, before moving inside where the Scarlet Crusade keeps their weapons.
The final fight of the instance is in the Great Hall against the Scarlet Crusade's champion, named Herod. For a guy who isn't wearing anything on his torso, he can take some serious punishment.
The Cathedral is the hardest wing of the Scarlet Monastery, mostly for its groups of multiple enemies, who will all come if one is attacked. Groups need to be very careful not to pull too many groups, or they will find themselves overwhelmed.
The final fight of the Scarlet Monastery is with the Crusade's two leaders, Scarlet Commander Mograine and High Inquisitor Whitemane, and unfolds in three parts. The first portion of the fight is against Mograine, a paladin, alone. After he is defeated, Whitemane comes out of a secret panel in the wall and fights you. When she is near death, she puts your entire party to sleep, resurrects Mograine, and heals herself to full. Then your party must fight them both at the same time.