How to read this page
The monsters below are organized by where you encounter them. For each one: how to recognize it from screen + audio, what kills you, and what works. Sidekick AI calls these out by name in real time during runs — this guide is the cheatsheet version.
Indoor monsters are about recognition speed. Outdoor monsters are about route discipline. If you learn the audio cue for each indoor monster and the kill range for each outdoor monster, you'll survive the first quota.
Indoor monsters
Snare Flea
Look: Spider-like, crawls on ceilings. Sound: Soft skittering above your head. Kills you by: Dropping on your head and suffocating you (multiplayer: a teammate can shovel it off; solo: you die). Counter: Look up in any new room. If you see one, back out.
Hoarding Bug
Look: Yellow loot-collector that picks up scrap and hoards it in nests. Sound: Short chittering. Kills you by: Aggro'd attack if you take its scrap or attack first. Counter: Leave the nest alone. If you must take its scrap, kill it first with 2 shovel hits — they're not tough.
Bracken
Look: Tall, thin, dark humanoid with a long head. Sound: Silent — that IS the cue. Kills you by: Snapping your neck when you're alone in a corner. Counter: Glance, walk away, do not stare. Staring escalates aggression. Move toward another player or back toward the entrance.
Thumper
Look: Two-legged dinosaur-shape with a long body. Sound: Loud running footsteps in straight halls; scream when committing to a chase. Kills you by: Trampling at speed in a long corridor. Counter: They can't turn fast. Juke around the next corner and they overshoot. Don't try to outrun them in a straight line.
Coil-Head
Look: Mannequin-like figure with a coiled spring for a head. Sound: Brief mechanical static when in your line of sight. Kills you by: Closes distance the moment you look away. One hit. Counter: Never break line of sight. Walk backwards keeping the camera on it until you're safe. They don't move if seen.
Coil-Head spotted in the corridor. Do NOT turn around. Walk backwards, keep your camera on it. The moment you blink it closes ten meters, and a Coil-Head one-shots.
Jester
Look: Wind-up jack-in-the-box, harmless until activated. Sound: Music-box winding (slow → fast → pop). Kills you by: Pops out as a fast enemy that catches anyone carrying scrap weight. Counter: The moment the music starts, leave the facility. You have ~60 seconds. Don't pick up more scrap, don't explore, just go.
Hygrodere (slime)
Look: Green sludge that slowly pursues. Sound: Wet bubbling. Kills you by: Walking into it. Counter: Walk around it. Trivial.
Spore Lizard
Look: Frog-like creature that puffs spores. Sound: Hisses, occasional bark. Kills you by: Rarely actually does — mostly bluffs. Counter: Back away slowly. They disengage when you're not threatening.
Nutcracker
Look: Toy soldier with a rifle. Sound: Heavy mechanical footsteps, then "click" before firing. Kills you by: Shotgun blast — 1–2 shots kill. Counter: Break line of sight when you hear the click. They reload between shots — that's your window to close and shovel-kill, but the timing is unforgiving.
Outdoor monsters (active mostly at night)
Eyeless Dog
Look: Large quadruped with no eyes. Sound: Low growl when nearby. Kills you by: Sound — sprints toward any noise above a threshold. Counter: Crouch-walk. Do not sprint. They cannot see you, only hear you. A crouched player passes within meters of one safely.
Forest Keeper
Look: Massive humanoid giant. Sound: Heavy footsteps, audible from across the map. Kills you by: Picks you up and eats you. Counter: Hide behind buildings. They have line-of-sight detection but lose interest quickly when out of sight.
Earth Leviathan
Look: Huge sandworm — invisible until it surfaces. Sound: Deep burrowing rumble that escalates the closer you are to its emergence point. Kills you by: Eats you whole when it surfaces under you. Counter: Keep moving when on open terrain. The rumble warns you ~2 seconds before it surfaces — change direction immediately.
Baboon Hawk
Look: Pack-hunting bird-monkey hybrid. Sound: Squawking in groups. Kills you by: Pack attacks — alone they're cowardly, in groups they swarm. Counter: Don't antagonize them. They steal scrap; let them. Only fight if you outnumber them.
Old Bird
Look: Massive abandoned mech, sometimes activates. Sound: Mechanical thrumming when waking up. Kills you by: Fires missiles at line-of-sight targets. Counter: When one wakes up nearby, get to cover and wait. They lose track of you if you stay hidden.
Passive / harmless
- Manticoils — small flying creatures, fully passive.
- Roaming Locusts — fly in clouds, only annoying if you stand in them.
- Circuit Bees — guard their hive, easy to avoid by walking around the hive.
What Sidekick AI does on monster ID
Most Lethal Company deaths happen because the player didn't recognize the monster fast enough. The AI watches every model that enters the screen and calls it out by name in real time. The single best moment is the Coil-Head — vision AI keeps tracking it even when you pan away, so you get a verbal warning the moment it starts closing distance. That alone removes a whole class of unfair-feeling deaths.
Summary
Most of Lethal Company's enemies are survivable when you recognize them. Snare Flea = look up. Bracken = don't stare. Coil-Head = don't blink. Jester = leave NOW. Eyeless Dog = crouch. Earth Leviathan = move. Sidekick AI is the second pair of eyes that does the recognition for you while you focus on the scrap and the clock.