From the Website:
In 1095, Pope Urban II called on the kings and knights of Europe to liberate the Holy Land in a great crusade. As one they lifted their voices to Heaven, crying deus vult - God wills it! This cry was taken up by thousands of knights and peasants, martyrs and madmen, as a great tide of righteous fury flooded across the world.
This cry was heard in the shadows, too. Since the days of the apostles, a secret order of warrior monks guarded the church and protected Christendom from all enemies, both natural and supernatural. Trained from birth and equipped with lost secrets of ancient civilisations, this secret order also hears the call to crusade. Deus vult - God will it, and they are the instruments of His divine Will.
It is the closing years of the twelfth century. Saladin has reconquered the Kingdom of Jerusalem, and the holy city is once more in the hands of the Saracen. Heresies and sorcery rot Europe from within, while the nobles quarrel and bicker. Even the church is falling prey to this corruption. The world must be saved, through any means necessary. No enemy, no sorcery, no doubt and no fear will prevent the monks of the Order from carrying out the Will of God. Deus Vult!