3.2 stars


Canon: Baseline
Series: Below Zero
Canon: Baseline Series: Below Zero

The head of an RPC-411 specimen with a damaged antenna. Photo taken during an autopsy.


Registered Phenomena Code: 411

Object Class: Gamma-Yellow

Hazard Types: Sapient Hazard, Organic Hazard, Grouped Hazard, Mechanical Hazard, Ballistic Hazard, Corrosive Hazard, Extreme Temperature Hazard

Project Personnel Info


Assigned Facility: Site-017

Research Lead: Dr. Jessica Avery

Assigned MST(s): Sierra-192 ("Shamu")

Director of Containment: Dr. Randolph Holmes


Containment Protocols: All 380 instances of RPC-411 are contained in Site-017's Mass Containment Wing, where a series of lightweight humanoid containment cells have been installed. Due to Site-017's remote location, all RPC-411 instances are given a 2 hour period where they are permitted to roam around a large plot of land outside of the facility twice a day. They are to be fed carbon-rich standard rations 2 times a day and have 2 operational water dispensers in their containment site at all times1, kept in a liquid state via heating. The internal temperature of the containment area is to remain at a steady temperature of −57 °C.

All 484 RPC-411-1 instances are contained in Site-017's Light Anomalous Technology Hangar. Their integrity is to be maintained whenever possible, and checkups are to be made on each unit every 2 weeks. RPC-411-2 is currently in the process of being excavated. Pieces of RPC-411-2, designated as RPC-411-2-A instances, are contained alongside RPC-411-1 instances in the Light Anomalous Technology Hangar.


An RPC-411-1 instance contained at Site-017 at a temporary holding cell following its discovery.


RPC-411: RPC-411 denotes an anomalous species of sapient humanoid beings under the Lepidoptera order, resembling moths in their outward appearance. The species is covered in a thick layer of white fur which, despite its fragility, is able to keep each instance warm. RPC-411 instances generate an abnormal amount of body heat, able to combat Antarctica's natural freezing temperatures. As such, most instances are unable to survive in environments hotter than −2 °C.

Instances stand at an average height of 2 meters, and newborn instances measure only 16 cm in length. The arms are located close to the base of the head and can extend up to 1 meter in front of the body. RPC-411 instances' are able to rotate their heads 170°, similar to that of species under the Strigiformes order. The species is incapable of flight, despite possessing wings, which measure 1 meter long on average. The wings are commonly used to assist RPC-XX instances in leaping great heights and distances.

Each RPC-411 instance has a muscular sac located near the back of the throat that produces a strong hydrochloric acid (designated RPC-411-A), of which an instance is capable of ejecting, or "spitting," from its mouth at a maximum recorded distance of 8 meters. The interior of RPC-411's throat, mouth, stomach, and lungs are coated with a type of anomalous, flexible chitin which is unable to be dissolved by RPC-411-A. Although RPC-411-A has been identified as a hydrochloric acid, it qualifies as a superacid, as the material has an overall acidity scale of 186%. RPC-411 instances are only capable of spitting RPC-411-A when in a period of acute mental and/or physical stress. Specimens use this as a means of defense, rarely using it as an offensive attack, as the sac produces RPC-411-A at a remarkably slow pace, taking an average of 1 day to fill completely. RPC-411-A superficially resembles water, but with a blueish tint.

RPC-411-1: RPC-411-1 refers to a collection of 5 mechanized diving suits, initially utilized by RPC-411 instances. RPC-411-1 instances are mainly cast of a baggy series of interconnected rings; each ring measures 12 nanometers in radius. These rings are composed of an unknown material with a hardness of 1878 on the Vickers scale. Each RPC-411-1 instance weighs approximately 12 pounds. This material is designated RPC-411-1-A

Most RPC-411 instances are capable of fitting snugly within each RPC-411-1 instance. When an instance is inside of an RPC-411-1, the RPC-411-1-A will harden and fold into a more solid form, acting as a strong shell. A hood will automatically cover the RPC-411 instance's head and is able to rotate with it. 5 holes are carved on the front and sides of each RPC-411-1 instance's hood, which are decorated to resemble human eyes with irides colored various shades of green and cyan.

Humans are unable to enter RPC-411-1 instances, as the fitting mechanic only activates of an RPC-411 instance is wearing one.

RPC-411-2: RPC-411-2 is a massive mechanical vehicle originally operated by RPC-411 instances. RPC-411-2 is now in a state of disrepair (see Discovery), but its primary structure remains intact. RPC-411-2 is identical to a blimp in structure, surrounded by an outer shell composed of RPC-411-1-A held together by various steel arcs and beams. 12 multi-jointed arachnoid legs protrude from the bottom of RPC-411-2, which are made primarily of steel and lead beams. It is unknown how these legs were able to animate, as no internal mechanical structure has been discerned to date2. A wooden chamber is suspended off the bottom of RPC-411-2, intended to house the majority of RPC-411 instances.

After RPC-411-2's destruction, pieces of the object (designated RPC-411-2-A) have transfigured into miniature versions of the anomaly, and continue to traverse RPC-411-2's original route. When faced with an obstacle, RPC-411-2-A instances will climb or jump over it. When encased entirely within a closed container, instances cease all movement.

Discovery: All 380 RPC-411 instances were discovered on June 23, 2019, when a massive sheet of ice collapsed, leading to the discovery of AR-17. During the discoveries of RPC-917 and several other hostile lifeforms emerging from the ravine, RPC-411-2 was spotted 13 meters east of the abyss. All 5 RPC-411-1 devices were walking beside RPC-411-2, each being piloted by RPC-411 instances. The patrolling instances were holding long, silver spears coated with a dark, viscous substance that emitted smoke.

Before Authority forces were able to reach RPC-411-2, RPC-917 sprinted towards the object and rammed into its side, knocking it over and breaking it off one of its legs. The RPC-411-1 instances threw their spears at RPC-917; the black liquid coating the weapons seeped into RPC-917 and appeared to slow down the entity's movement. The remainder of the RPC-411 instances exited RPC-411-2 and began spitting at RPC-917 collectively. Both RPC-917 and the RPC-411 instances were subdued by ASF personnel3.

All specimens were originally hostile towards Authority operatives, but they began to cooperate when several instances were given medical attention. MST Sierra-192 ("Shamu") formed a circular formation around the horde of RPC-411 entities and were instructed to follow them back to Site-017. It was discovered that all instances were fluent in Armenian and an unknown language4 which has yet to be translated.

All instances were temporarily contained in Site-017's 2nd Mess Hall5 for a period of 2 weeks before their current containment site was renovated.

Addendum 411.1: Interview Log 411.138

Addendum 411.2: Items Recovered from RPC-411 Instances & RPC-411-2




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