Dark Jebi, also known as "Fallen" Jebi were Jebi-potentials, frequently former Jebi, who chose to follow the dark half. Although "Dark Jebi" originally referred to a Jebi who had fallen, it could also refer to the uninitiated who received no Jebi training but began their careers under another Dark Jebi. Others were simply dark-half users who did not follow the teachings of the Spiff or other dark organizations.
Dark Jebi also became a term of note, where fallen Jebi served under the Dark Lords of the Spiff. Examples include bounty hunter Rhast, Starcutter and briefly Typhon, under the influence of the Symbiocolate.