William Manton was a former member of Cauldron and one of the foremost experts on parahumans.


Described as being selfish and closed off because of his intellect, and covetous of those relationships he does have.


He is known to have a wife, since divorced, and a beloved daughter.

Little is known about his wife, including whether she is dead or alive.

His daughter forms the basis of the Siberian's projection, and assuming that it is a realistic image and is not an idealized version that Manton consciously or subconsciously created, then she is relatively young, definitely post-pubescent, and possibly younger than twenty.


Manton is around middle age. His activities do not leave him much time to take care of himself[1] causing degradation in his appearance.

He has a tattoo on the back of each hand,[2] on the left is an omega symbol, on the right is a stylized swan. Used to mark victims of the Simurgh and those who stood in solidarity with those same victims. Manton was never in the vicinity of a Simurgh attack.[3] While the Simurgh was not a factor in his initial defection from cauldron it was a factor with him later.[4]

Abilities and PowersEdit

Manton is intelligent, highly observant and a trained scientist, specializing in Parahumans and their abilities.

Heavy Spoilers read at your own risk

In a throes of grief and guilt from ruining his daughters life by giving her a vial Manton imbibed one for himself.[4]

After taking the Cauldron vial, Manton is able to project an image of his daughter, though naked and striped in black and white, hence her name - the Siberian.

The Siberian can ignore natural forces as she sees fit, and is effectively invulnerable. She is also able to project this invulnerability to other people by being in physical contact with them, though she is not able to make Manton himself invulnerable.[5]

There are several other limitations. It likely takes concentrated mental effort from Manton to be able to use the Siberian.[6][7] He must remain within a few miles of the projection otherwise it will disappear, and he cannot alter or change it. Whether he can maintain the projection while he is asleep is an open question.


While on the run Manton used a car primarily to keep up with the Siberian projection, as it is far faster than any normal human on foot, and secondarily as protection, as the Siberian is seemingly unable to project her invulnerability directly onto Manton.[2]



William is known as a famous researcher into capes, and the one for whom the Manton Effect - i.e. the inability of most parahumans to affect living matter - was named after.

He worked at Cauldron for some time. However, after he went through a very ugly divorce, he tried to give his daughter superpowers using one of their formulas and failed, he quit and fled with stolen formula.[8]

Story StartEdit

Manton is currently presumed missing. Cauldron falsely told Legend that Manton was responsible for the Case 53's having absconded with stolen vials.[3]


The formula William stole allowed him to become the Siberian.

His true identity was discovered through the efforts of the Undersiders and the Travelers. Though having safely followed the Nine from a distance, when his Siberian was testing Panacea his projection is confronted by the joined group and told by Tattletale that they know his secret.

He dismisses and reforms the Siberian closer to his location. While the rest of the Protectorate leaves to fight the Nine's other members, Legend and Siberian continue their battle, while Manton reveals his existence to Jack and Bonesaw before hiding with them in an Endbringer shelter. Skitter finds them and attacks the trio with a swarm on insects, grievously injuring Manton. 

Manton is able to use the Siberian to save Jack and Bonesaw from the PRT's second bombing. Skitter is able to attack him as he races to save them.

Bonesaw cocoons him for an hour in a specialized case created with some Mannequin components to regenerate/weather the venom's,[9][10] afterwards this same casket would house Cherish

He is recovered after Jack and Bonesaw return from fighting Skitter and Panacea, and is taken along with them when they deal with Cherish and leave the city with Hookwolf in tow.

Cauldron had used Manton as a scapegoat for the Case 53 phenomenon when in fact they were doing it themselves unknown to everyone, excepting Legend initially.

Post-Slaughterhouse NineEdit

The truth about his abilities were revealed by Legend, who repeated the lie that it was Manton who was responsible for the Case 53's when explaining the Protectorate's connection with Cauldron to Gully and Weld.[11]


During the conflict in Boston between Defiant, Dragon and the Slaughterhouse Nine, Manton is caught in the mechanical jaws of one of Dragon's armored craft and killed.


Was resurrected by Bonesaw as part of the Slaugherhouse 9000.

Gold MorningEdit

Manton's clone would rejoin Cauldron, and fight against Scion.



  1. Prey 14.1
  2. 2.0 2.1 Prey 14.7
  3. 3.0 3.1 “I’ll explain for those of you who lack access to the PRT records or the time to peruse them. Siberian is not a brute-class cape. Siberian is a ‘master’, and the striped woman is a projection. I caught a glimpse of the man who is creating the projection before they retreated.” - Excerpt from Interlude 14.y
  4. 4.0 4.1 Dwood:2017 July 11 4:19 PM:
    Was Manton Simurghed?

    Wildbow:2017 July 11 4:20 PM:
    Manton went off rails after his daughter had a bad vial reaction
    and the Simurgh only factored in later, post-Hero-kill.

    Twei:2017 July 11 4:22 PM:
    Like, it's not just that he went off the rails
    It's how far he goes off the rails and how fast

    Wildbow:2017 July 11 4:23 PM:
    It's almost like drinking a psychically
    sensitive/reactive potion of dead god-virus-space-whale while in the throes of grief and guilt isn't a good idea. - Discord conversation archived on spacebattles
  5. Siberian can touch him, s/he can’t use her power on him. - Comment by Wildbow on Sting 26.4
  6. Primary swarm in first. As one singular mass, they flowed inside. The capsaicin-laced bugs joined them, going straight for the eyes.

    Jack reacted, as did the man, but Bonesaw was unfazed. I saw Siberian flicker. Legend noticed as well. He snapped his eyes to me, and then the shelter.

    The creator needs to concentrate? - Excerpt from Prey 14.7
  7. - [ Excerpt] from Snare 13.10
  8. 8.0 8.1 Interlude 15.z
  9. Prey 14.10
  10. Might as well share: Siberian’s real body was being kept in a specialized case created by Bonesaw with some Mannequin components. Left in there for an hour to regenerate/weather the venoms. Relatively easy process to get him out, put Cherish in, do the surgery on her corona aurora, change some settings and seal her inside. - Comment by Wildbow on Prey 14.11
  11. Scourge 19.4
  12. Migration 17.6
  13. On the subject of Siberian's powers, there's one detail that people haven't really caught, that surprised me.
    The link is in both Alexandria's interlude and 17.6. - Discussion with Wildbow on

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