Our Last Crusade or the Rise of a New World (2020)

S1E1 The Encounter of the Two Nations' Ultimate Weapons

For a century, the Empire and the Nebulis Sovereignty have been locked in conflict. Iska, imprisoned after liberating a witch, finds a glimmer of hope for his freedom. The condition? He must hunt down an immensely powerful astral mage dubbed the "Ice Calamity Witch."