Fabius Bile
Fabius Bile is a Chaos Space Marine. Prior to the defeat of the Horus Heresy, he was Lieutenant Commander and chief Apothecary of the Emperor's Children. During the Heresy he took part in his legion's attack on Earth, although neither Fabius Bile or his legion were actually involved in the siege of the Imperial Palace, instead attacking the general population. In the legion's unrestrained fervor, millions of Earth's civilians were murdered. Bile used the opportunity to perform horrific experiments on captives. Human victims were rendered down to create special drugs which brought the legion more pleasure. It is possible that Earth served as the first example of Fabius Bile's subsequent atrocious experiments on entire planetary populations.
Bile left Earth before Horus's death, along with a retinue of altered followers. He is a renegade even of his own Legion. Unlike the Emperor's Children, Bile does not follow Slaanesh, instead devoting himself to science, and research into the creation of Space Marines. While he was still chief Apothecary of the Emperor's Children, he began to secretly experiment into ways of altering the gene-seed at the instruction of the Primarch Fulgrim with the intention of further perfecting the Legion. These experiments led to the first examples of Noise Marines among other things.
In the first few centuries following the Heresy, he travelled the galaxy offering his services to rebel commanders in return for prisoners or ancient technical libra. Many of these ambitious overlords came to regret allowing Fabius's experimentations on their people, as the results of his atrocities became apparent. He was nearly caught by the Salamanders chapter in the Arden system and has now set up base on one of the Eldar Crone Worlds within the Eye of Terror. He has forged alliances with the various Chaos Space Marine legions and promises to give them warriors to replenish their forces in return for protection.
Fabius styles himself 'Primogenitor', claiming he has unlocked the secrets in the creation of the Primarchs and the Space Marines. The pinnacle of his foul art is the "New Man", creatures who possess strength and intelligence superior to any human, as well as the worst traits of mankind. As Fabius leaves behind planets of corrupted human abominations, the Adeptus Astartes and the Inquisition strive to purge these creations, and are forced to destroy entire populations.
He has mastered the technique of cloning. Possibly related to this was the creation of a clone of Horus, which was destroyed by the Black Legion.
He experiments on himself just as readily as on any of his victims, resulting in vast variations on his strength and other abilities. His experiments on others brings uncertain results. Sometimes the experiment is a success, creating psychotic killers, superhuman even in comparison to their corrupted Chaos brethren, sometimes the subject's metabolism disintegrates in the face of the stress, resulting in instant death.
Weapons and abilities
In addition to his already impressive augmented physiology, Bile is equipped with the Chirurgeon, a warp tainted mechanical device attached to his spine, it pumps daemonically charged black ichor around his body giving him unnatural resilience. Spidery limbs tipped with vicious saws, blades and other twisted variations of medical devices extend over his shoulders, which act as both the tools of his experimentation and a means of attack.
He is also equipped with the Xyclos Needler, a gun that fires virulent poison darts and the daemon-forged Rod of Torment which when it strikes, is able to incapacitate almost any enemy with unbearable pain.3