The Mother Elf was created as the ultimate weapon during the era of Cyber Elf development, towards the end of the Maverick Wars, the conflict that lasted throughout the Mega Man X series. As revealed in Mega Man Zero Official Complete Works, she was created from the Maverick Virus data in Zero's body, as a "Sigma Antibody Program" capable of counteracting the Maverick Virus and Sigma's DNA. This was not the first attempt made to counteract the threat of the Virus; however it was the first of such attempts to actually be successful on a large scale. According to legend, Mega Man X used the power of this Elf to finally destroy the Maverick Virus' negative attributes, thus erasing Sigma from existence for good, ending the Maverick Wars. The fighting did not cease, however.
Following the construction of Neo Arcadia, the Elf was stolen from a laboratory by the evil Dr. Weil. Weil, who reportedly placed a "curse" on her. Dr. Weil then used her to instigate what came to be known as the Elf Wars. As revealed in Mega Man Zero 3, this tumultuous period was so violent that 90% of all Reploids and 60% of all humans were killed. X and Zero together stopped Weil and his reploid Omega, and after Zero went to sleep for 100 years, X sealed the Elf away at the base of Yggdrasil using his own body as the seal.
The Elf then disappeared into myth and legend along with Zero for 100 years, until the commander of the Resistance, Elpizo, sought to gain the power of the Elf during the events of Mega Man Zero 2. This quest led Elpizo to seek out the two Baby Elves, which in turn led him to an area deep inside Neo Arcadia, where he destroyed the original X's body and released the Dark Elf. The Elf gave Elpizo powers, but not enough with which to defeat Zero. After healing Elpizo and turning him into a Cyber Elf, the Dark Elf vanished after faintly saying "...Zero...".
The Dark Elf was seen again in various forms of prominence during Mega Man Zero 3, mostly tying into the mysterious Dr. Weil. It was Neo Arcadia's goal to recapture the Dark Elf, and Dr. Weil, in exile because of his crimes, returned with his creation Omega under false pretenses of helping Neo Arcadia capture the Elf, when all he really wanted was to use the powers of the Elf for his own purposes. Zero saw through the facade, and defeated Weil's reconstructed Copy X while hunting the Dark Elf. At the end of his journey, Zero encountered the Elf once more, in which it powered up his original body (inhabited by Omega). Upon Omega's ultimate defeat, the curse of Weil was finally broken, and the Dark Elf became good once again. She protected Zero from the explosion caused by Omega's destruction, and took him back to the Resistance Base. What happened to the Mother Elf afterwards is unknown.
Alignment:Lawful Good (As the Mother Elf, she is used by Mega Man X to bring an end to the Maverick Wars that has gone on for centuries without end, erasing Sigma once and for all), Lawful Evil (As the Dark Elf, she is used to cause chaos and destruction. Due to being cursed, she follows the orders of evil characters such as Omega and Elpizo)
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