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The Walrider

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Outlast by ravvenn-d6mvkqq

 The Walrider has other uses. Please see The Walrider (Disambiguation) for other meanings. 

The Walrider

Known As:

The Swarm
The thing in the dark
Nano swarm
Nano cloud

First appearance:

Administration Block
(Actual Appearance)

Last appearance:

Underground Lab

Biographical information


Created in 1947






Billy Hope
(Previous Host)
Miles Upshur
(Current Host)
Martin Archimbaud
Rudolf Wernicke
(Formerly, as Creator)


Chris Walker
The Variants
Security Forces

Physical information


N/A (Masculine)


6'8" (207 cm)






White (From Camcorder)

Chronological information

Notable facts:

The Main Antagonist of the Outlast.


The Walrider also known as The Swarm is the main antagonist and the final enemy encountered in Outlast. It is behind the madness that seems to infect most of the asylum's inhabitants and is the deity of Father Martin's religion and his followers. It is first encountered at the start of the Sewer level, after escaping from the prison.


While looking ghostly in nature, the Walrider is actually a swarm of nanites; small, nanoscopic machines who possess great strength and power. It took possession of William "Billy" Hope. As it is shown by this document, when Billy was undergoing Morphogenic Engine Therapy, he learned to self-direct the lucid dream states, he was then capable of controlling the Walrider.


As it is composed of nanites, it is nearly invisible to human eyes, only showing a feint black aura. Miles can only see it clearly through the night vision on his camcorder. The Walrider has immense physical strength, and is the most physically powerful entity in the game. It can easily overpower any Variant, including the large, muscle-bound Chris Walker, as is seen in the Underground Lab when Walker is brutally murdered. When attacked by the Walrider, the result will be an instant death. The Walrider is relentless in its pursuit, while doors will slow it's progress somewhat, it is capable of going underneath them.


William Hope
William "Billy" Hope.
OrmuAdded by Ormu
The Walrider attacking Miles.
OrmuAdded by Ormu
Walrider fusing with Miles
The Walrider fusing with Miles.
NewGenTVAdded by NewGenTV

The Walrider is seen multiple times throughout the game, its presence can be seen in the Courtyard scouring the air, as well as one encounter behind the locked gate. Project Walrider was the process of exposing patients to Morphogenic Engine Therapy to create a suitable vessel for the nanite swarm, for only a person that has seen enough horror can become the host. The aim was to create the perfect host for the Walrider, so that it could become a sentient being, as is evidenced by these notes: Gods and Monsters, Variant Postmortem. It is likely that The Variants are the results of this procedure. Billy was capable of controlling the Walrider, with his self-directed lucid dream states, however because they were only using damaged and unstable minds to experiment on, the situation got out of control. The Walrider slaughtered everyone except one. Dr. Wernicke was kept alive by Billy all this time. When Miles reaches the Underground Lab, Dr. Wernicke, who was thought to be dead, instructs Miles to disable the power of Billy's life-support pod to undo what he has made, to murder Billy. After Miles shuts down the life-support pod, the Walrider, now without a host, attacks Miles and fuses itself with his body, taking him as its new host. As Miles limps towards the exit in pain, the door opens, revealing Dr. Wernicke and several soldiers. The soldiers open fire, but Wernicke realises that Miles has become the sentient host. As the screen fades to black, the Walrider can be heard attacking as the soldiers scream in agony.


  • The Walrider is based off the nightmare creature from German folklore called "Alp", who is also called "Walrider". Alp is said to originate from the mountains of Germany, similar to how the Walrider originated from Mount Massive. Both of them also have the ability to fly and turn partially invisible, as well as shapeshift.
  • The Walrider and Chris Walker have the same height of 2.07 m.
  • In the game's configuration, The Walrider is dubbed as "NanoCloud".


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