After King Arthur was betrayed by Lancelot and Mordred, prophecy warned Camelot would fall to Saxons and a Wight Dragon unless Arthur’s heir drew Caliburn. Arthur's illegitimate son, Kael, a stable boy, trained by Merlin and Elisse. Slaying the Wight Dragon and saving Rhaenyra, Kael earns a place in Round Table trials, facing scorn. As Undead Armies storm Camelot and Prince Aegon confesses Arthur’s betrayal, Kael draws Caliburn under Rhaenyra’s protection, awakening Crimson Dragon blood.