Arthur Pendragon becomes the king of Camelot at the age of sixteen after pulling the holy sword Excalibur from a stone. Initially, he is a noble, warm, and resolute monarch, dedicated to justice, peace, and protecting humanity. Trained by Merlin, he becomes a skilled combatant, with Excalibur granting him the knowledge and mastery of all previous wielders. Following the trauma of losing his right arm to the creature Cath Palug, Merlin awakens Arthur as the vessel of Chaos, the rightful King of Chaos. This union grants him immense regenerative abilities and reality-altering magic. Over time, his ideals twist into tyranny. Driven by witnessing humanity’s suffering during the Holy Wars at the hands of demons, goddesses, fairies, and giants, he rejects peaceful coexistence and launches a campaign to eradicate all non-human races from Britannia. His appearance changes as well: he loses his right arm, replacing it with a dark armored prosthetic, and his Chaos form gives him black sclera with purple irises. He wields Excalibur and later forges Carnwennan, a self-mending Chaos blade. His reign becomes defined by invasions, forced relocations, and ideological re-education, transforming the hopeful young king into a formidable antagonist intent on reshaping existence for human supremacy.