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Although this article is based on canonical information, the actual name of this subject is conjectural. |  |
B7
- “- Herein lies your truest strength.
- The energy of the Demon. Its spirit.
- Its heart.
-This is how you...
- Created the First Slayer? Yes.” - ―The Shadow Men and Buffy Summers[src]
The Shadow demon was an ancient demon used by the Shadow Men to create the First Slayer.
History
Origin
The demon's exact origins are unknown. At some point in the past, it had been captured and controlled by the Shadow Men, who would use it to create the First Slayer.
The Era of Sineya
The Shadow demon being unleashed by the Shadow Men.
The Shadow Men chose a girl named Sineya to contain the power of the demon. They chained Sineya to the ground so that she could neither defend herself nor escape, then unleashed the demon, which appeared to be in the form of dark black energy vapors. It forcibly merged itself with Sineya, granting her superhuman strength, speed, reflexes, agility, superior healing factor, a predator instinct, innately formidable combat techniques and quite possibly some kind of advanced prophetic ability. However, the process also caused the First Slayer to lose touch with her own humanity forever. Future Slayers were able to retain their humanity, but not have as much power as the First Slayer.
War Against the First
The demon trying to merge with Buffy.
Thousands of years later, the Shadow Men tried to repeat history with Buffy Summers in order to empower her even more so she would be able to defeat the Turok-Han army of the First Evil. However, Buffy sought knowledge, not power, especially if that power meant that she would lose her humanity. She repeatedly denied the entry of the demon into her, forcing it and keeping it out. Buffy then broke free from her chains to stop the Shadow Men, thus effectively incapacitating the shadow demon.
After she was shown the Turok-Han army, however, Buffy had doubts on whether she should have accepted the increased strength that the demon would have given her. Through the scythe, Willow would divide the power of the Slayer with numerous potential rather than just Buffy and Faith, ending the original linage of slayers.
Powers and abilities
Power bestowal
Upon being merged with Sineya, the demon granted her slayer powers. It likely possessed all Slayer based powers. Subsequent slayers, through the magic of the Shadow Men, be granted the same powers, just not as potent as the First Slayer's. It also allowed Slayers to be connected with each other even after death.