The original Prince Flamadin was the twin brother of Princess Sharadim, set to become Empress of their home realm of Draachenheem, one of the Six Realms of the Wheel. While Flamadin would often go on adventures, his sister was secretly gaining the support she needed to become Draachenheem's War-Empress. It is custom there for royal siblings to marry, but when she recalled Flamadin home to ask he honor that custom in order to consolidate her political power, he refused and planned to tell the realm of her schemes. So she fatally poisoned him and claimed she exiled him for attempting to kill her, making him out to be a disgraced ex-Prince. She kept his body preserved in a secret room to perform strange rituals upon it.
When John Daker completed his existence as Urlik Skarsol, Sepiriz convinced and guided him to re-board the Dark Ship That Sails Between the Worlds. Its crew, the Blind Captain and his brother the Steersman, took him to the Six Realms. A new body identical to Flamadin's was waiting for him there, standing next to Ulrich Von Bek. When he exited the boat, he was in the Prince's body, and Ulrich became his closest companion on their quest for the Dragon Sword.
Sharadim sought the Dragon Sword so she could trade it to Archduke Balarizaaf, a Chaos Lord trapped at the center of the Six Realms, in return for the power to conquer them all and become immortal. Flamadin and his companions sought the sword to stop her, and to free the female cosmic dragon within.
Its counterpart, a male cosmic dragon, had guided the male Eldren of a world where they were being hunted by the Mabden to a safer place without Mabden. After he succeeded, the female dragon then left with the female Eldren to guide them there. But before she could complete her task, she was trapped by the Dragon Sword at the moment of its creation, as Black Swords have a habit of drawing in and trapping demons and other such creatures within them at the time they are forged.
With the dragon taken midway, the Eldren were left trapped in the Six Realms, and their race would soon perish unless the Dragon was freed to guide them home. After the Eldren women gave Daker the Actorios Stone and explained their predicament to him, he felt he owed it to his Eldren Princess Ermizhad to save them. He and Ulrich went on a quest across the Realms of the Wheel to find and recover the Dragon Sword, in which they were joined and guided by Alisaard, an Eldren Warrior who looks and sounds exactly like Ermizhad. During the course of their adventure, she and Ulrich fall in love, and Daker couldn't help but feel jealous of him for it.
When they find the Dragon Sword, Sharadim steals it using the real Flamadin, whom she turned into a soulless zombie under her control. He briefly sucked out Daker's soul to take the sword, and used it to damage the barrier between the Six Realms and the demon realm enough that Balarizaaf and his army would soon break through. Daker only recovered his soul by reaffirming his belief that he was not Flamadin or the Champion or anyone else besides John Daker.
After Daker killed Flamadin, Sharadim took the Dragon Sword, and he allowed her to destroy the Actorios Stone. In destroying it, she trapped a different piece of her soul in each of the thousand shards of the Actorios, and allowed Daker to execute a ritual Sepiriz said could only be performed once per cycle of the multiverse. By doing so, he summoned the Warriors at the Edge of Time, an army of Eternal Champions waiting at the Edge of Time for their final battle. With the help of the Warriors and the portion of Sharadim's army that would listen to him, Daker defeated Balarizaaf and his army of Chaos and prevented them from invading the Six Realms.
After reuniting with the Eldren women, Daker split the Dragon Sword on the Iron Round, an ancient Eldren anvil, freeing the female cosmic dragon that was trapped within it. She then guided Ulrich and the Eldren women to the new home of the Eldren, a nation that would become known as Melniboné. The two halves of the Dragon Sword would later be reforged into Stormbringer and its twin, Mournblade.
As Sepiriz promised, Daker then boarded the Dark Ship for the last time. He dreamed about the events of The Quest for Tanelorn before waking and disembarking from the ship, only to return to his original life as John Daker in the modern era. He had now gained a greater appreciation for his normal life than when he left, and was confident he would find Ermizhad there in some form or another.