When Archbishop Gustaven, the legend of the Holy Sacrian Empire, was still a priest, he encountered the giant snake Aguilok, the Calamity of Rethramis. After a battle that lasted the whole night, Aguilok fell, and so did Gustaven, exhausted after striking a mighty blow to the snake's belly with his rod. When the soldiers came to the scene, however, Aguilok had disappeared. All that was left was a bloodstained rod protruding from the earth.
"Do not show yourself again in Rethramis, you foul creature! Remember this rod! I will be here to face you again when you return!" - Archbishop Gustaven