Anywhere above 15 miles depth within ADF-39-1.

Scale Scuttlers are small, roughly a foot long when grown, armored scavengers that share similar characteristics to Horseshoe crabs or insects like Isopods or Millipedes. Scale Scuttlers have a sectioned shell protecting their underside. They have rows of eyes in between and beneath the sections of their shell, which they'll spread their shell out to look around. Their eyes have adapted to have night vision and see extremely far. Scale Scuttlers have an extendable organ that grabs and grinds food, then pushes it into its stomach.

Scale Scuttlers are extremely shy and will run away if they hear, see, or feel anything approaching. Scale Scuttlers reproduce multiple times in their 8 year lifespans, and live in carved out nests deep into the flesh. Colonies of Scale Scuttlers happen often, and they've been as large as over 200 organisms feeding and caring for young together.

Top 5 miles of ADF-39-1.

Pitfall Plants are large flowers located directly on the ground. They are not very tall and can be stepped on, but they are usually 8 feet across. Stepping on the sensitive petals of the Pitfall Plant will cause it to tighten the fibers inside, closing its petals around the victim. The middle of the flower will then open up and grind the victim up slowly, emptying into its stomach in which its digested and circulated through the plant. It will cough out anything it cannot or did not digest then open the petals and restart.

20–25 miles depth within ADF-39-1.

Concavers are extremely aggressive predators that can reach well over 30 feet. They have beady eyes that can see even in pitch dark. They have a solid white membrane over their real bodies, which when threatened or threatening will peel back to reveal a mouth with rows upon rows of teeth along with their actual skin. Concavers got their name from the fact they store young offspring, uneaten food, or claim territory usually inside branching caves of ADF-39-1 and will strike anything that gets close to their cave. Concavers will compete over females, resulting in large scale free-for-all battles for just one partner.

Concavers are going extinct, as they only reproduce once or twice over their 45 year lifespans, kill each other frequently, and their large size makes it very hard to find ample food. Concavers have sticky feet and will climb on walls or use their large size to jump across cliffs.

Anywhere in ADF-39-1.

The Bone Forger Disease is a disease that causes the structure of your bones to break down. It can be transmitted via ingestion, the air, wounds, touching, or nearly any other form of disease contraction.

Anywhere in ADF-39-1.

Blood Grass feeds off the organic nutrients of ADF-39-1, known for its signature deep red color caused by consumption of highly nutritious blood rather than water. Blood Grass exists in large fields and can reproduce very quickly, though it sits nearly at the bottom of the food chain.

Top 3.5 miles of ADF-39-1, as well as the surrounding outside near the basin.

Sky Terrors have been spotted up to 5 miles away from the edge of ADF-39-1's basin. They are small flying organisms similar to Pterodons, acting as scavengers and carnivores, and have severely impacted local wildlife and farming.

⚠ ADR Bounty Active: $20 USD per Sky Terror carcass. Contact Facility 39 for collection.

Anywhere in ADF-39-1 or outside.

Fleshworms operate similarly to leeches, grabbing onto a part of an animal and digging their teeth in. Through a tube in each tooth, they pierce blood vessels and suck red blood cells directly out of the bloodstream. If fertile, they will also inject their young into blood vessels, where they will grow, move into arteries, and eventually burst out of the host's tissue.

Dark sections of ADF-39-1.

Os Mortis are holes in the ground of ADF-39-1 that produce the aroma of different types of meat via glands that release meat-smelling odors. Due to the darkness of their habitat, it is common for predators to approach and fall into the pitfall trap-type stomach, where they are digested and nutrients spread through the body via roots about 15–20 feet down. Their openings are only 1–2 feet in diameter, but the internal pot can reach up to 5 feet in diameter, lined with downward-facing teeth to prevent escape and a system of valves to flood the pot with digestive acid. Pressure sensors extend 3 feet around the hole to detect approaching prey. Os Mortis have been shown to digest even bone and metal, and can tangle their roots fighting with other instances of their species for space.

On the surface of any living organism with blood. Especially common near Facility 39.

Rusters are small shelled creatures that latch onto hosts and suck iron out of their bloodstream. They resemble barnacles and attach via hook-like teeth that pierce blood vessels. They will attempt to stay on one host as long as possible, but will relocate if needed. Their specialized digestive system turns iron into energy by effectively burning it, causing them to release small amounts of smoke periodically. They are not social, but will group over a shared host without benefiting each other. They will occasionally lay eggs on the host's surface, allowing young to begin growing immediately. Young on dead hosts rarely survive.

Lungs of ADF-39-1. Clusters densely near high-traffic areas.

Aleviola are bud-like organisms standing about 4 feet tall, anchored to the floor or walls of ADF-39-1. They take in air via pores, remove and consume impurities such as dead skin cells and particulate matter, and release clean air back out. Aleviola have no response to predators, but their thick external hide makes them nearly impenetrable. Their underground roots, however, are fragile.

Bloodstream of ADF-39-1.

Eye-I are small fish roughly 8 inches long, characterized by a single large disk-shaped eye that spans the full width of their body, giving them nearly 360 degree vision with only small blindspots directly in front and behind them. As Eye-I swim through ADF-39-1's fluid channels, oxygen bubbles and iron particles accumulate on their bodies, drawing an uncomfortable parallel to red blood cells that ADR researchers have noted and cannot stop thinking about.

Eye-I school in large groups and are high in protein, making them one of the most commonly preyed upon organisms in ADF-39-1. They have no meaningful defensive capabilities.

Dead bodies.

Blood Shot Shrooms are extremely obscure, as they rapidly consume dead bodies and very few samples have ever been recovered — none have lived long enough to be tested. They are theorized to have extremely fast metabolisms and to have evolved to eat minerals inside ADF-39-1 if needed, allowing them to digest even human-made materials. They leave behind a fine powder, presumed to be feces.

15–40 miles deep into ADF-39-1.

Cache Spiders live in burrows and operate socially like ants, reaching about 3 feet in diameter. They have 12 legs arranged in a circular pattern around a central tube body with a large mouth. They create openings in their burrows to grab and bite anything that gets near, which also serve as exits for pack hunts. They overwhelm prey by swarming and carry pieces of flesh back to the colony.

Cache Spiders build large underground cities, sometimes hundreds of feet wide and dozens of feet deep, containing recreational areas, storage, nurseries, barracks, and more. Humans have explored abandoned cities, though this is not advised as residents may still be present. Different kingdoms are identified by unique scents and are hostile to all other kingdoms and species. They are highly intelligent and will beg humans for food in exchange for affection, typically rubbing against researchers like cats.

Cache Spider castes include children, servants, soldiers, hunters, gatherers, and builders. Most notably: Royalty. No Royal Cache Spider has ever been directly observed, but traces suggest they may reach 9 feet in diameter.

10–20 miles deep into ADF-39-1.

Milisnakes are an endangered species of ambush predator. They have a large number of legs and a thick segmented shell, and crawl along the ceilings of ADF-39-1. They drop onto unsuspecting creatures and wrap around them, using an underside mouth to cut up flesh and pull it into their digestive system. They adhere to ceilings via a sticky substance coating their feet, and reach 20–25 feet long and 3 feet wide.

Milisnakes are not selective hunters, targeting anything they can successfully land on. In practice, this is rarely their intended prey. Many die from missing targets entirely and landing on their own bellies, or from dropping onto Apex Predators. They are also non-social and will kill each other. This, combined with late and slow reproduction, has pushed them toward extinction.

Plateaus of Blood Grass throughout ADF-39-1.

Blood Buffalos are large, tanky herbivores roughly 12 feet long and 6 feet tall that graze on Blood Grass in herds. They need to eat constantly and are almost always moving or grazing. They have 3 eyes and exceptional hearing, but lack any natural defenses, compensating instead with very fast and early reproduction.

Blood Buffalos maintain a basic herd hierarchy with one Alpha per group, but different herds are friendly toward each other and will sometimes merge into a single herd with two Alphas.

Named as a homage to the Water Buffalo. Neither live up to their name.