I froze as the factory went quiet and a wet slap echoed down the corridor. My teammate slid, shouted, and became an afterimage on my monitor. By the time I found the green smear on the floor, v80 had already rewritten how we die.
I’ve run dozens of sessions so you don’t waste yours. I’ll point out the tells, the traps, and the exact behaviors that force you to change how you move, call for backup on Discord, or bail the mission altogether on Steam. You’ll get the short version you can act on and the small details that win or lose a run.
You can hear a wet slap on metal from two rooms over. Lethal Company v80 monsters
v80 drops three new critters into the forest moons and brings back one that used to be the definition of “annoying.” These additions tweak the tempo: fights stop being purely reactionary and start asking you to notice, mark, and reroute. I’ll break each one down—how they behave, where they spawn, and the single move you need to survive.
What new monsters are in Lethal Company v80?
Short answer: Backwater Gunkfish, Cadaver Bloom, Feiopar, and the returning Kidnapper Fox. Each changes a different part of the loop—vision, routing, attention, and positioning respectively. If you’re watching Twitch or skimming Reddit clips, these four are the ones clipping your highlights.
Backwater Gunkfish
- Exclusive to forest moons? – No
- Threat level – Low
- Rarity – Common
The Gunkfish looks like an aquatic oddity and makes that wet, slapping sound when it moves. It’s timid by default and flees from players, but it leaves a lasting consequence: a viscous green goo. The goo obscures your screen for about five seconds and remains on the map where the fish fled.
The goo is an oil slick across the floor. Step into it and you slide—sometimes straight into a death pit or into a monster that’s been waiting for sloppy movement. If you stream on Twitch or clip plays on Steam, your viewers will see the exact second you lose traction.
Cadaver
- Exclusive to forest moons? – No
- Threat level – Low
- Rarity – Uncommon
The Cadaver Bloom is the game’s first toxic flora and it loves facilities. It usually starts near the main entrance and spreads through corridors in predictable patterns, not random patches—meaning you can map it and plan around it. Close proximity poisons your filter, generating fever, red-screen effects, fatigue, and eventual death.
In co-op, a player who succumbs becomes a grotesque plant-flesh hybrid, turning your team’s advantage into a liability. If you monitor your air filter or swap to a fresh filter when the first spores hit, you can delay the worst effects long enough to escape.
How dangerous are the v80 creatures for co-op runs?
They’re not all kill-on-contact, but they change roles in the mission: visual denial, path control, attention policing, and player removal. Cadaver is the slow, systemic threat that punishes prolonged exposure; Gunkfish and Feiopar demand better spacing and line-of-sight discipline; the Kidnapper Fox removes a player from the map in one clean movement. Use Discord callouts and markers in the map to keep teammates from wandering into those hot zones.
Feiopar
- Exclusive to forest moons? – Yes
- Threat level – Low
- Rarity – Very rare
The Feiopar is a panther-like stalker that hates being watched. You’ll usually hear it hissing or purring before it moves. It hugs the tree line, disappearing into canopy and waiting for you to look away. If you fail to maintain direct sight, it will pounce.
The Feiopar is a coiled spring in the underbrush. If you try to melee it, it climbs to the canopy and waits for the exact moment when your attention slips to strike. Treat it like a high-value target: keep one eye on it and force it to move away from your planned path.
Kidnapper Fox
- Exclusive to forest moons? – Yes
- Threat level – Low
- Rarity – Very rare
The Kidnapper Fox is back but tempered. It hides in Vain Shrouds and stays inside that patch unless provoked. Vain Shrouds expand faster if you land on the same moon repeatedly. The Fox will lasso a player with its tongue, reel them in, and kill them if you’re too close when it strikes.
It’s less aggressive than the version removed in earlier builds, but it still punishes poor positioning. Mark Vain Shrouds on your map, call them out on Discord, and avoid camping near their edges. If you’re streaming or posting clips to Reddit, the Fox’s grab is the kind of highlight clip that spreads fast.
If you want a practical rule: treat vision and surface state as resources. Protect your line of sight, keep moving in places with goo, replace filters near spores, and call out rare spawns on Discord or Reddit so your team adapts. Which of these new threats will ruin your run first?