Weil's Past

Background
Dr. Weil was a human scientist who participated in the project to design the original Cyber-elf, the Mother Elf. In this project, Dr. Weil was a coworker and rival of the ancestress of the future Resistance leader Ciel, and both of them had significantly different views on how the Maverick Wars should be resolved. Weil made weapons to use against the Mavericks and specialized in Reploid revival, and viewing Zero's body as the ideal weapon to end the wars, used it to develop Omega, while his partner worked on analyzing Zero's cognitive program in hopes of finding a cure for the Maverick Virus.

Although the Mother Elf was completed and was successfully used by X to end the Maverick Wars and eliminate the virus altogether, Dr. Weil was dissatisfied with these results. He believed that the Reploids should pay for the carnage their wars caused and submit to humanity. Dr. Weil proposes Project Elpizo, a plan to combine the Mother Elf with Omega to exert control over all Reploids so they would never harm a single human again, putting Weil at odds with X and his ideals of coexistence. As humans were fearful of another lengthy war, many favored the project.

Around this time Weil had built a copy body of Zero though the purpose is unknown.

Elf Wars
To further push his agenda, Weil secretly took control of the Mother Elf and reprogrammed her, transforming her into the Dark Elf and created clones of her called Baby Elves. The Baby Elves were used to control Reploids, forcing them to fight each other in a massive battle.

The conflict spread fear and destruction worldwide, resulting in increased support for Project Elpizo. However, X and Zero (whose program was put into the copy body) managed to recapture the Dark Elf, and used her power to turn the war in their favor, forcing Dr. Weil to unleash Omega onto the battlefield. The Elf Wars were now drawing to a close, yet even as the Dark Elf took control of the Reploids and eliminated the Mavericks, the humans of the time modified Weil's body into a cyborg contained within a bio-mechanical suit that would allow him to heal more quickly and rejuvenate from otherwise fatal injuries, preventing him from experiencing deterioration and death. Omega, supported by an army of Golems, would slaughter countless numbers of humans and Reploids before finally being defeated by X and Zero, finally bringing the war to an end. But even in victory, the question of what to do with the defeated but not destroyed Weil and Omega remained.

In the aftermath of the war, the Eight Gentle Judges delivered their final verdicts to Weil and Omega. As Dr. Weil's memories had been converted into data he would never forget his crimes, so it came to pass that Weil was banished into the wastelands he had created to suffer eternally therein. Feeling betrayed due to being exiled by the humans, Dr. Weil began to plot his revenge on both human and Reploid alike. Omega was also sentenced to exile, but in his case he was suspended in Earth's orbit, sealed within the Forbidden Ark.