Every layer of Casualties: Unknown is patrolled by hostile subterranean fauna, automated military defense turrets, proximity landmines, and toxic cave flora. Use this 25-entry encyclopedia to filter threats by classification, inspect their HP or damage profile, check spawn strata, and apply the exact countermeasure before trauma cascades.
Filter all 25 documented threats by classification (Fauna, Trap, Turret / Mechanical, or Environmental Hazard) or search by enemy name and spawn layer to view verified HP/damage values and field countermeasures.
| Threat / Hazard Name | Classification | HP / Damage Profile | Spawn Layers | Behavior & Anatomical Trauma Vector | Verified Countermeasure & Disarm Protocol |
|---|---|---|---|---|---|
| Cave tick | Fauna / Parasite | 15 HP | Layers 2, 4, 5, 7 | Small swarming arachnid spawned from Cave tick spawners; inflicts bleeding bites and wound infection | Destroy Cave tick spawners early and clear swarms with wide melee hitbox swings |
| Shade crawler | Fauna / Predator | 100 HP | Layers 1, 2, 3, 4, 5, 6, 7 | Ubiquitous subterranean ambush creature that stalks dark tunnels and lunges at limbs | Keep tunnels lit with Flashlight/Headlamp and strike with Machete or Claw pack |
| Thornback | Fauna / Predator | 280 HP | Layer 5 (Overgrown Depths) | Spined jungle beast capable of causing deep lacerations and fractures | Use ranged firearms or high-cutting melee weapons and carry Dressings |
| Overgrown tick | Fauna / Parasite | 300 HP | Layers 5, 7 | Mutated giant tick with 20x the health of a normal Cave tick; inflicts heavy bleeding and infection | Kite backwards while firing Pistol/Shotgun or slashing with Titanium machete |
| Sand stalker | Fauna / Predator | 400 HP | Layers 3, 4, 5 | Burrowing desert predator that ambushes survivors near sandstone and oil pools | Avoid fighting while slowed in viscous Oil pools; use elevation and firearms |
| Manifestation | Fauna / Aberration | 450 HP | Layer 8 (Crystalline Hollow) | Flying crystalline entity that patrols vertical shafts in Crystalline Hollow and knocks players into fatal drops | Engage from stable ledges with ranged weapons or bypass using Jetpack |
| Snow strider | Fauna / Predator | 500 HP | Layer 6 (Frozen Chasm) | Cold-adapted predator hunting between Ion space heaters; drops Strider pelt for warm crafting | Fight near heat sources to avoid simultaneous hypothermia and limb trauma |
| Tentacle-plant | Fauna / Carnivorous Flora | 1500 HP | Layer 5 (Overgrown Depths) | Massive stationary carnivorous plant that ensnares and crushes passing survivors; drops items when destroyed in 1.0 | Keep distance or use explosives (Dynamite) / Shotgun blasts |
| Grabber-shroom | Fauna / Fungal Predator | 2000 HP | Layer 7 (Fungal Pools) | High-HP fungal ambush organism that snatches limbs and causes dislocations | Spot mycelial tendrils before descending shafts; sever or bypass |
| Elder thornback | Apex Boss Predator | 6000 HP | Layer 5 (Overgrown Depths) | Deadliest creature in the caves ("A very large threat"); massive 6000 HP pool, capable of fatal crushing and dismemberment | Evade via narrow tunnels (crouching/crawling) or use heavy ordnance; killing one unlocks "Not big enough" achievement |
| Laser Drone | Automated Security | Mechanical Drone | Layer 9 (Geothermal Vents) | Patrolling security drone firing precision thermal laser beams that inflict burns and bleeding | Use solid building cover and EMP/ranged bursts |
| Cryo Drone | Automated Security | Mechanical Drone | Layer 9 (Geothermal Vents) | Security drone deploying freezing projectiles that rapidly drop body temperature and slow movement | Destroy from cover and use Geothermal Vents ambient warmth to recover |
| Turret & Ceiling Turret | Mechanical Trap | Ballistic Gunshot + Shrapnel | Layers 3, 4, 6, 10 | Automated ballistic sentry with targeting light beam (turret lights pass through blocks in 1.0); solid buildings stop bullets | Watch for targeting light cones, take cover behind solid structures, and extract shrapnel with Tweezers if hit |
| Landmine & Gunmine | Explosive Trap | Blast / Dismemberment / Shrapnel | Layers 3, 4, 6, 10 | Pressure-triggered floor explosives that cause fractures, internal bleeding, shrapnel, and limb dismemberment | Scan floors carefully with light sources; disarm or trigger from safe distance by throwing rocks |
| Sound Cannon | Acoustic Trap | Hearing Loss / Brain Concussion | Layers 4, 10 | Emits devastating sonic blasts (visual indicator added in 1.0; cannot activate immediately after spawning into a layer) | Wear Earmuffs and exit the acoustic cone when the indicator activates |
| Skullcrusher & Piston | Crushing Trap | Severe Blunt / Head Fracture | Layers 5, 9, 10 | High-force mechanical smashers that fracture skulls, cause brain trauma, or crush limbs | Wear a Helmet (Bicycle/Riot/Makeshift) and time sprints past the piston cycle |
| Sawblade & Sidestabber | Laceration Trap | Severe Arterial Bleeding / Dismemberment | Layers 7, 9, 10 | Rotary blades and wall-mounted lances capable of instant limb dismemberment in Release 1.0 | Keep Tourniquet and Alginate dressing ready; jump or wall-slide past blade tracks |
| Bear Trap, Spike Trap & Barbed Fence | Mechanical Trap | Limb Pinning / Deep Puncture | Layers 1, 2, 3, 4, 5, 6, 7, 9, 10 | Clamps onto legs or punctures feet on landing, causing fractures, bleeding, and dirty wound infections | Check landing zones before dropping; disinfect punctures immediately with Alcohol/Antiseptic |
| Coil (Tesla Trap) | Electrical Hazard | Electric Shock / Cardiac Fibrillation | Layers 5, 10 | Discharges high-voltage arcs (with electric particles in 1.0) that trigger cardiac arrhythmia or fibrillation | Carry an AED or Amiodarone and avoid metal/wet conductive proximity |
| Geyser & Lava Geyser | Environmental Hazard | High-Velocity Launch / Thermal Burn | Layers 1, 2, 5, 6, 8, 9, 10 | Erupts periodically, launching the player into ceiling spikes or spraying molten Magma in Layer 9 | Observe eruption intervals before crossing vents |
| Radioactive Barrel & Spent Fuel | Radiological Hazard | Acute Radiation Sickness | Layers 4, 10 | Emits continuous ionizing radiation that fills the radiation icon and decays cellular health | Monitor with Geiger counter and dose Anti-rad bottle or Soothing crystal shard |
| Tile Fluids (Oil, Magma & Radwater) | Environmental Fluid Hazard | Exhaustion Drowning / Lethal Burns / Radiation | Layers 3, 4, 9 | Oil in Layer 3 rapidly drains stamina causing drowning; Magma in Layer 9 incinerates limbs; Radwater in Layer 4 irradiates | Keep fluid containers inside backpacks so they do not auto-fill with hazardous tile liquids; use ropes/bridges |
| Distorted Crystals (Turbulent / Blood / Volatile) | Mineral Hazard | Shockwaves / Bleed / Status Anomalies | Layer 8 (Crystalline Hollow) | Large distorted crystals carry hidden properties that trigger when approached or shattered | Inspect crystals closely from safe footing; harvest beneficial Oxygen, Relief, Digestion, and Soothing shards |
| Falling Icicles, Thin Ice & Fan Traps | Glacial Hazard | Piercing Trauma / Chasm Plunge | Layers 6, 9, 10 | Thin ice collapses underfoot into sub-zero chasms while Fan traps blow survivors off narrow ledges | Use Climbing claws or Grappling hook to anchor against wind and collapsing ice |
| Lab Security Guards & Scientist | Human Hostiles (Escape Ending) | Ballistic Firearms | Surface Lab (After Layer 11) | During the Unchipped Escape Ending, shooting the scientist alerts waves of armed guards while you perform abdominal surgery | Complete the 5-step cargo extraction surgery under 60 seconds before the heavy reinforcement wave arrives; avoid killing guards for Pacifist |
Subterranean fauna such as Cave ticks, Shade crawlers, and deep-layer predators target exposed limbs with lacerating bites that rapidly introduce Wound Infection. Destroy biological spawners from max melee reach with a Machete and disinfect bite wounds immediately with Alcohol or Disinfectant.
Automated turrets, ceiling laser grids, and proximity mines inflict catastrophic ballistic punctures, shrapnel fractures, and Internal Bleeding. Use terrain excavation to tunnel beneath turret sightlines, trigger mines from cover with thrown debris, and keep a Tourniquet and Procoagulant syringe hot-slotted.
Thermal geysers, stalactite falls, spike pits, and hazardous flora punish careless sprinting in low visibility. Illuminate shafts ahead with Emergency Lights or Rose Lights, watch for steam or spore particles, and maintain stamina reserves before jumping across trapped chasms.