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Btvs Although this article is based on canonical information, the actual name of this subject is conjectural.

Herein lies your truest strength. The energy of the demon. Its spirit. Its heart.
―The Shadowmen[src]

An ancient demon was used by the Shadowmen to imbue its powers into the first Slayer.[1]


Primordium Age[]

In the Primordium Age, the Shadowmen chose a girl named Sineya to contain the energy, spirit, and heart of a demon. They chained Sineya to the ground then unleashed the demon, which appeared to be in the form of dark vapors. It merged itself with Sineya, granting her and the Slayer line powers[1] such as prophetic dreaming, strength,[2] durability,[3] speed,[4] and healing.[5]

The process also caused the First Slayer to lose touch with her own humanity. Future Slayers were able to retain their humanity, but they did not have as much power as the First Slayer.[1]

21st century[]

Thousands of years later, in 2003, the Shadowmen tried to repeat history with Buffy Summers in order to empower her even more so she would be able to defeat the First Evil's Turok-Han army. However, Buffy sought knowledge, not power, especially if that power meant that she would lose her humanity.[1]

Buffy denied the entry of the demon into her, forcing it and keeping it out. She then broke free from her chains to stop the Shadowmen, thus effectively incapacitating the demon.[1]