ONA
Description
Kall-Su is a central antagonist and one of the Four Divine Kings of the Dark Rebel Armies in the Hell's Requiem arc. He was once the right-hand man, best friend, and most powerful disciple of the legendary wizard Dark Schneider. His primary goal is to resurrect the God of Destruction, Anthrasax, to create a Sorcerer’s Kingdom, a utopia ruled by magic and sorcerers.

Kall-Su was born to a human mother and a father who was not human, suggested to be an Ice-Dragon in human form. From a young age, he was feared, hated, and ostracized by the people of his mother's village. Driven to desperation by the villagers, his mother attempted to kill him using a magical sword called the Ice Falchion. Kall-Su survived the attack and, in an instinctive act of self-defense, used his burgeoning magical powers to kill his mother and destroy the village that had tormented them both. Soon after this traumatic event, he was discovered and taken in by Dark Schneider, who was accompanied by a young Arshes Nei. Dark Schneider raised Kall-Su and taught him how to control his magic, and their relationship became a close, near-symbiotic bond. Kall-Su's magical affinity for ice was a mirror image of Dark Schneider's own fire-based abilities, and Schneider came to regard him as his other half, the missing piece of himself he was searching for.

Kall-Su is known for being incredibly cold, stoic, and distant, a personality that reflects his mastery of ice magic. He rarely shows emotion and maintains a calm, analytical demeanor even in the midst of battle. The only person capable of drawing out any real feelings, whether joy, anger, or admiration, is Dark Schneider. Having been rejected by his own mother and all of humanity, Kall-Su developed a deep-seated hatred for people and a profound sense of isolation. After Dark Schneider was seemingly killed during the Golem Wars, Kall-Su was once again plunged into despair. To give himself purpose, he resolved to continue the dream he and his master had shared to conquer the world. His desire to resurrect Anthrasax is also tied to a twisted psychological need, as the God of Destruction speaks to him in a feminine, maternal voice, and he comes to see Anthrasax as the mother he always wanted.

As one of the Four Divine Kings, Kall-Su is a primary leader of the Dark Rebel Army following the death of Dark Schneider. At the start of Hell's Requiem, he has become the mightiest power on Earth, waging a campaign to conquer the four kingdoms of the Metallion continent and collect the seals needed to awaken Anthrasax. He commands a group of powerful subordinates known as the Sorcerer Shoguns. While he is a formidable conqueror, he often takes a passive role in the early stages of conflict, preferring to analyze his enemies' battles before committing his full force. His most critical role in the story is his eventual confrontation with the resurrected Dark Schneider on the flying city of King Crimson Glory.

By this point in the story, Kall-Su has come under the direct mental influence of Anthrasax, who has amplified his hatred for humanity and turned him into a puppet. He fights Dark Schneider in a colossal magical duel. However, upon realizing that he has been completely manipulated by Anthrasax, Kall-Su breaks free from its control and seemingly sacrifices himself to protect his former friends. Thanks to his regenerative abilities, he survives this act and later joins the final battle against the awakened Anthrasax. Throughout the arc, there are hints that his cold nature belies a deep, unresolved loyalty to Dark Schneider, the only person who ever showed him kindness.

Kall-Su is acknowledged as one of the most powerful sorcerers in the world, with magical power said to rival that of Dark Schneider himself. He is the greatest known master of ice magic. His abilities include casting spells that can freeze entire cities solid, and he was able to defeat over one hundred wizards simultaneously during his assault on the Kingdom of Whytos Neiki. His known magical arsenal includes a variety of spells: Axis, which creates a crushing water dragon; Biscaya, a massive blast of ice; Danzig, which creates a swirling ice mirror to reflect attacks; Thanatos, which encases a target in ice; and Y&T, which summons ice wolves. His most potent spell is Testament, an absolute zero blast of cold air that is said to immobilize the movement of atoms and annihilate everything it touches. He also possesses a superhuman healing factor that allows him to regenerate from injuries that would be fatal to any normal human.