Zero Zephyrum

• Name: Zero Zephyrum
• Age: Unknown (appears to be in his early twenties)
• Hobbies: Talking with Grandark
• Likes: Getting praised, Grandark, quiet places
• Dislikes: Fights, Eclipse, noisy places
• Weakness: Lack of presence

A long time ago, the wars between Demons and Ancient Demons, called the Ancient War, broke out. The demons succeeded in attacking the Ancient Demons while the strongest warrior, Duel, was away, and took the victory. But afterwards, Duel continued his battle and took victories in many of them with numerous strong demons until he was defeated by Heitaros and got imprisoned in Purgatory.

Doctor Oz, who was praised as the great wizard of the Demon World, was also one of the defeated. The defeat did not just make him seek vengeance, but even made him feel awe of Duel. In preparation for the re-encounter with Duel, who escaped from the Purgatory, Oz decided to craft the Demon Sword that could overcome The Eclipse, Duel’s Demon Sword.

After many years had passed, when the vengeance and awe were gone, and only the desire to achieve remained in him, he finally succeeded in creating Grandark, which was comparable to Eclipse.

But was it because the sword was too powerful? The sword’s ego did not recognize Dr. Oz as its master, and Oz ended up creating a creature with a body that was strong enough to wield the sword, and that was Zero. Zero was able to wield The Grandark, though the control was imperfect. However, Dr. Oz called Zero a failure, and he was keen to create another creature.

One day, the Hardliners attacked his lab. Dr. Oz stayed alone in the lab to hide Grandark and helped Grandark and Zero escape. Zero, who had to leave the lab without any explanation given, thought that the reason for his existence was only to win a victory against Duel and the Demon Sword Eclipse, and began his long journey to find them.