Perception
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Details
Perception determines your character's overall awareness and effectiveness with ranged weapons. It also affects your character's chance to detect hidden passages, objects or stealthed creatures and NPCs. It does not increase your vision or visible range. Perception does not directly affect your chance to hit, but rather increases your ranged weapon skills, which in turn increases your chance to hit with ranged weapons. Melee weapon hit rate is unchanged but increased with melee skill (through strength or dexterity). No items require perception to be used or equipped.
High perception score is important for characters who wish to use ranged weapons or find traps, stealthed enemies and secrets.
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Directly affected skills |
Other effects |
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Related feats
See Category:Perception feats.
- Snooping increases perception by 3 for the purposes of finding secrets.
- Increased Perception veteran feat increases it by 2.
Related items
Headwear
Adaptive Goggles (+1 Perception on equip)
Cyclop's Eye (+1 Perception on equip)
Synesthetic Refocus (+2 Perception when equipped and character is focused, -2 Perception when character is unfocused)- Synesthetic Refocus(Hexagon) (+3 Perception when equipped and character is focused, -3 Perception when character is unfocused)
Metal Helmets (-1 Perception on equip)
Aegis Sec-trooper Helmet E (-1 Perception on equip)
Praetorian Lawgiver (-1 Perception on equip)
Gas Mask (-2 Perception on equip)
Tchortist Bioscrubber (-2 Perception on equip)
Perceptual Isolation Helmet HD (Perception set to 1)
Suit
Tchortist Noble Robe (-1 Perception on equip)
Tchortist Rassophore Armor (-1 Perception on equip)
Biohazard Suit (-2 Perception on equip)
Fire Proximity Suit (-2 Perception on equip)
Blast Suit (-2 Perception on equip)
Robe (-2 Perception on equip)
Tchortist Robe (-2 Perception on equip)
Tchortist Vathosphore Armor (-1 Perception on equip)
Food
All-in (temporarily +3 all base abilities)
Boolean (temporarily -3 all base abilities)
Mushroom Salad (temporary +1 Perception)
Junkyard Surprise (temporary random base ability effect, can only decrease Perception)
Clean Deal (temporary -1 Perception)
Mushroom Brew (temporary -2 Perception)
Kzozel E (temporary -2 Perception)
Stalagdrop (temporary -1 Perception)
White Dude (temporarily -2 Perception)
Cave Tear (temporary -3 Perception)
Drugs
Third Eye E (temporary +3 Perception for the purpose of finding secrets)
Bioluminous Marsh Honey E (temporary +2 Perception)
Supersoldier Drug (temporary +2 Perception)
The Juice (temporary +1 Perception)
Perception checks
Discovering secret areas is based on Perception score alone, unlike detecting traps and stealthed characters, which is based on Detection. Discovering some secrets requires prior knowledge instead of Perception score.
In addition to secrets, Underrail: Expedition expansion added visible in-world Perception checks similar to Strength, Dexterity and Agility checks.
Base game
- This list is incomplete; you can help by expanding it.
| Location | Secret | Requirement | Details |
|---|---|---|---|
| Lower Caves, South Gate Outposts, Area South outposts, inside NW outpost (Forlornstations1.png) | Trapdoor | 6 Perception | connects the two south outposts |
| Lower Caves, South Gate Outposts, Area South outposts, inside NE outpost (Forlornstations1.png) | Trapdoor | 6 Perception | connects the two south outposts |
| Lower Caves, South Gate Outposts, Area East outpost, inside the outpost (ForlornStations4.png) | Trapdoor | 7 Perception | connects east and northwest outposts |
| Lower Caves, South Gate Outposts, Area East outpost, northeast tunnels (ForlornStations4.png) | Trapdoor | 8 Perception | connects east and northwest outposts |
| Under-passages Lower Passages Dungeon, (Dun lup-a.png) | Passage | Quest trigger or 11 Perception | entrance to the next area in the Camera problems quest |
| Under-passages area 1, near SGS (lup-a1.png) | Door | 7 Perception | secret room along east wall, Strange Comm Device oddity |
| Lower Underrail, GMS compound level 1 (GammaCompound1.png) | Safe | 7 Perception | secret safe in room near southwest corner |
| Lower Underrail, GMS compound level 2 (GammaCompound2.png) | Secret passage | 7 Perception | secret room along east wall, Old Data Medium oddity |
| Lower Underrail, GMS compound level 3 (GammaCompound3.png) | First aid box | 7 Perception | SW room, hidden under couch, medicine including an Advanced Health Hypo |
| Lower Caves, east from GMS compound level 3 (cv12.png) | Secret crawlspace | 8 Perception | leads to the back entrance of the raider base |
| Lower Caves, raider base | Adrenaline shot | 8 Perception | under Gerhard Page's bed |
| Lower Caves between Mushroom Cove and Junkyard (jyt1.png) | Underwater rock bridge | 8 Perception | leads to a small island |
| Lower Caves, Siphoner Pools, northeast (jyt3.png) | Underwater rock bridge | 8 Perception | leads to the northeast corner of the cave |
| Lower Caves, Water Treatment Facility | Plasma cell | 6 Perception | under a table in the power room |
| Lower Caves, Water Treatment Facility | Shotgun shells | 8 Perception | on top of a locker in the SE room on the upper level |
| Lower Caves, Water Treatment Facility | First-aid kit | 7 Perception | in the SE room on the lower level, random medicine |
| Lower Caves, Water Treatment Facility | Hidden opening | 9 Perception | secret compartment in the ventilation system, Deathstalker corpse with Crawler's Eye oddity |
| Lower Caves, Water Treatment Facility | Secret crawlspace | 7 Perception | along north wall on the lower level, leads to secluded room with loot |
| Silent Isle, southeast (si1.png) | Underwater rock bridge | 7 Perception | leads to a small island with a corpse with random Mutated Dog Leather Armor |
| Junkyard, Security control room of Depot A east area (ojy2.png) | Secret door | 10 perception | shortcut bypassing the turrets |
| Lower Underrail area 6, Lunatic camp (lu-a6.png) | Hidden stash | 8 Perception | secret footlocker near rock pile |
| Upper Caves, south of Milton's camp (lux-a10.png) | Underwater rock bridge | 7 Perception | shortcut between the north and south bank of the river |
| Upper Caves, ironhead camp, two zones north of the Bunker (Lux-b16.png) | Hidden stash | 10 Perception | NW corner of map, through the backside of the camp, contains a Jumping Bean and random tabi boots |
| Upper Caves, Synesthete camp, under the Oculus | Hidden stash | 11 Perception | in the rock next to the Synesthete, contains roughly 300 charons |
| Upper Caves, misty river north of Hecate caves entrance | Underwater rock bridge | 9 Perception | leads to a box containing a Niobium Piercing Set |
| Lost Vault entrance | Hidden ventilation shaft | 9 Perception | leads into the shack behind the trader |
| Lost Vault interior | Hidden first-aid box | 7 Perception | random medicine |
| Lost Vault interior | Hidden footlocker | 7 Perception | in room along north wall, contains Circular Wave Amplifier |
| Lost Vault interior | Hidden bag | 10 Perception | in the northern room along west wall, accessible only with 11 Strength, contains two advanced mechanical and electronic repair kits and a lighter |
| Lost Vault interior | Hidden sack | 9 Perception | South-western room, accessible only with 11 Agility, contains Greater Fusion Cell, two Fusion Cells and two Plasma Cells |
| Lower Caves, south of Crossroad Caves (cv2.png) | Trapdoor | 8 Perception | connects southwest and southeast corner, locked box with random psionic mentor |
| Lower Caves, south of Crossroad Caves (cv2.png) | Underwater rock bridge | 7 Perception | shortcut bypassing siphoners |
| Lower Caves, south of Camp Hathor (cv19.png) | Underwater rock bridge | 7 Perception | shortcut bypassing rathound nest |
| Lower Caves, Rathound King Lair (rkl2.png) | Door | Quest trigger or 10 Perception | shortcut leading outside if you offer to kidnap Sarine or negotiate a truce with Camp Hathor |
| Lower Caves, Rathound King Lair, outside (cv21.png) | Door | Quest trigger or 15 Perception | shortcut leading to the lair if you offer to kidnap Sarine or negotiate a truce with Camp Hathor |
| Lower Underrail, Abandoned Warehouse (aw1-1.png) | Secret crawlspace | 7 Perception | secret ventilation shaft section with a footlocker and a rathound |
| Rail Crossing, behind bar (rc1.png) | Secret door | 7 Perception | leads to Deacon's shop |
| Rail Crossing, Buzzer's Shop's ventilation shafts (rc_shop 3.png) | Hidden Ventilation Shaft | 7 Perception | secret ventilation shaft section with Hardware Bug |
| Lower Underrail, The warehouse from Dude's vision (lu-b4.png) | Secret crawlspace | Quest trigger | leads to the lower level of the warehouse during Dude's quest |
| Free Drones Base, east room | Trapdoor | 11 Perception | can't be opened; handle breaks |
| Upper Caves, north from the Hanging Rat bar (lux-c2.png) | Hidden stash | 11 Perception | secret stash inside rock pillar (not visible on the linked map) |
| Foundry, Evelyn's home (fo3.png) | Trapdoor | 10 Perception | connects Evelyn's house and bunker |
| Foundry, Evelyn's home (fo3.png) | Secret crawlspace | Quest trigger | leads to Evelyn's bunker if a male player character has a drink with her |
| Lower Underrail, cave west of Foundry (lu-b22x.png) | Hidden stash | 10 Perception | secret stash inside rock pillar |
| Core City, SW middle level (Cc17.png) | Ladder | 14 Perception | leads to Phreak's hideout, utility section electric coil area |
| Core City, utility section (Cc_utility.png) | Squeeze through gap in pipes | 11 Perception (can be bypassed with night vision mode of the Goggles) | leads to Phreak's hideout, boilers area |
| Core City, Utility Facility steam area | Junk pile | 7 Perception | Contains TiChrome Spikes and a Boot Spring, NW corridor |
| Core City, Utility Facility steam area, through the door east of the steam console, near Modified Industrial Bot | Plasma cell | 10 Perception | Plasma Cell and a Plasma Core |
| Core City, Utility Facility electric coil area | Phreak's laptop | Quest trigger | laptop hidden in trash pile in his hideout, available after his disappearance |
| Core City, Utility Facility electric coil area, SE room on 2nd floor | Bag | 8 Perception | random knife |
| Core City, Drop Zone (cc15.png) | Secret door | Quest trigger or 6 Perception | leads to Bogdan's hideout, can be found with perception or by learning about it from Kupusije during Find Bogdan, or with perception after starting Sewers generator/Retrieve ICPD |
| Core City, inside one of Drop Zone buildings (cc5_1.png) | Trapdoor | 8 Perception | leads to the basement |
| Core City, north Core City Sewers (cc_s2.png) | Door | 8 Perception | leads to a secret room on the west side containing some loot |
| Core City, northwest Core City Sewers (cc_s6 2.png) | Switch | Quest trigger | opens door to Acid Hunters' hideout during the Look for Cornell quest |
| Core City, Zaman's Lair, Underground lake (Cc zamanscave2.png) | Hidden stash | 9 Perception | contains around fifty UN dollars |
| Core City, Port Zenith warehouses | Hidden safe | 9 Perception | Hidden locked safe in Captain Wilkinss room, contains fifty United Stations Dollars, an energy pistol and a Fusion Cell |
| Upper Underrail, east of Notus Living Block (up3x.png) | Trapdoor | 7 Perception | connects trapdoor and a Lunatic base |
| Upper Underrail, inside Panacea Lab (plb.png) | Switch | 8 Perception | opens door to the room in the northeast corner |
| Upper Underrail, Gubbins' banidt camp (Up7.png) | Ventilation Shaft | 8 Perception | connects inside of structure to outside, north of the barrel fire |
| Utility Tower, first room past metal gate | Ventilation Shaft | 9 Perception | ladder leading up, skips some floors |
| Institute of Tchort, armory, behind the locked fence (Tch-mil.png) | Box of ammo | 8 Perception | x11 12.7mm W2C Rounds |
| Institute of Tchort, utility section 2, south room (Tch-util2.png) | Box | 8 Perception | one Aegis, three Gizzard Enzymes |
| Institute of Tchort, utility section 3, northwest corner (tch-util3.png) | Morphine shot on file cabinet | 10 Perception | one morphine shot |
| Institute of Tchort, utility section 3, northeast corner (tch-util3.png) | Ventilation Shaft | 8 Perception | connects west wing and utility section |
| Institute of Tchort, west wing, in coil spider room (tch-ww2.png) | Ventilation Shaft | 7 Perception | connects west wing and utility section |
| Institute of Tchort, Harpocrates Station, north room (tch_met.png) | Secret crawlspace | Quest trigger | leads to the ventilation system during Track down Rassophore Nevil |
| Institute of Tchort, Upper Underrail Ventilation System (tch_mv1.png) | Secret crawlspace | 8 Perception | secret ventilation shaft section with a box |
| Institute of Tchort, Upper Underrail Ventilation System, southwest room (tch_mv1_2.png) | Secret trapdoor | 10 Perception | leads to hidden basement |
| Deep Caverns, lake, northeast bank (dc-lk.png) | Underwater rock bridge | 7 Perception | leads to a small island with hackable box |
| Deep Caverns, lake, southwest islet (dc-lk.png) | Sniper rifle | 10 Perception | reveals Black Arrow sniper rifle |
| Deep Caverns, Hollow Earth (dc-la2.png) | Secret crawlspace | 8 Perception | secret entrance to the small building on the east |
| Deep Caverns, checkpoint between Caerus and warehouses (dc-cp1.png) | Underwater rock bridge | 8 Perception | leads to the east bank of the lake |
| Deep Caverns, Warehouse Block 2, south toxic storage (dc-wh3.png) | Trapdoor | 8 Perception | leads to lower level, Electrokinetic Imprint mentor |
| Deep Caverns, Caerus Residential, northwest building, second floor (dc-res2 2.png) | Ventilation Shaft | 10 Perception | leads to a cavern with Gunter Vasilica, Pseudo-spatial Projection mentor, and Regenerative Mixture |
| Deep Caverns, Caerus Residential, west apartment (dc-res3.png) | Safe | 6 Perception | secret safe |
| Deep Caverns, Arke Power Station, utility section toxic storage (dc-pp_ut.png) | Trapdoor | 11 Perception | connects toxic storage and storage room |
| Deep Caverns, Arke Power Station, utility section storage room (dc-pp_ut.png) | Trapdoor | 10 Perception | connects toxic storage and storage room |
| Deep Caverns, Deep Mushroom Forest (dc-fs4.png) | Secret tunnel | 9 Perception | leads to the northwest corner and a skeleton |
Expedition
- This list is incomplete; you can help by expanding it.
| Location, Underrail | Secret | Requirement | Details |
|---|---|---|---|
| Abandoned Waterway Facility, east zone, on the island south of the bridge | Hidden stash | 8 Perception | exceptionally high-quality Mutated Dog Leather |
| The Rig, room #2 | Note (The Rig) | 5 Perception | under the bed |
| Rig Periphery, Waterways 9 | Hidden stash | Quest trigger or 16 Perception | discovers Knuckles' stash |
| Chancer's Bay, NE map | Hole through wall of shack | 10 Perception | biohazard boots, corrosive acid, Encyclopedia Fragment oddity, mutants |
| Isaac's River, northernmost map | Hidden stash | 10 Perception | stash in north wall of cave |
| Core City Docks, empty room next to Ray's shop | Vent in north wall | 10 Perception | leads into Ray's shop, dying burglar |
| Dude's House - Core City | Cracked floor panel/wall safe | 5 Perception | key to wall safe/the safe itself |
| Dude's House - Caves | Footlocker under bed | 9 Perception | psionic mentor |
| Gray Army Base - Barracks, two rooms east of the rift | Secret trapdoor | 8 Perception | electronic components |
| Gray Army Base - Schtab | Wall safe | 9 Perception | secret safe in north wall of northwest room |
| Gray Army Base - Schtab | Secret opening | 9 Perception | Connects northern and southern parts of the ventilation system |
- This list is incomplete; you can help by expanding it.
| Location, Black Sea | Secret | Requirement | Details |
|---|---|---|---|
| Black Sea (E4), north side of island | Entrance to cave | 11 Perception | entrance to pirate prison trash dump, leads to Thrasher, a boss hermit crab |
| Siphoner Pools (Black Sea) | Underwater rock bridge | 7 Perception | leads to a lingula plant and a random treasure "crevice" |
| Siphoner Pools (Black Sea), west chamber | Buried box | 11 Perception | SGS credits, Charons, US dollars |
| Black Sea (C8), hopper island cave, north wall, west side | Hidden stash | 9 Perception | secret stash in cave wall, Bolt Quiver and some special bolts |
| Black Sea Grotto (A10), Yngwar's cave island, hidden walkway in water on east side | Hidden stash | 8 Perception | secret stash in cave wall, contains coagulation shot, two antidotes and four rusting acid cvials |
| Mutie Refuge, crane room | Hidden vent shaft | 7 Perception | secret vent shaft through wall into crane room |
| West Storage Depot, lvl 2, east room | Hidden box of bullets | 6 Perception | 30x 9mm Standard Rounds |
| West Storage Depot, lvl 2, southeast room | Hidden box of bullets | 9 Perception | 11x 12.7mm Standard Rounds |
| West Storage Depot, lvl 3 by the elevator | Hidden vent shaft | 8 Perception | secret vent shaft to blocked room |
| Crimson Meadow Horticulture Center lower floor, west section, north side | Hidden vent shaft | 11 Perception | secret vent shaft through wall |
| Black Sea (I1), outside the Health Center, SE corner | Hidden hole through wall | 10 Perception | secret passage to hidden room |
| Black Sea (I2), tower north of Health Center, 2nd floor | Hidden corpse | 9 Perception | corpse with loot (can be looted without detection) |
| Nexus of Technology, level 1, SE room | Hidden wall safe | 9 Perception | safe contains Energy Shield Emitter and two Plasma Cells |
| Port Crag, east building | Hidden pipe tunnel | 9 Perception | drawl through to west building, 2nd floor (agility 8; it is from the other direction) |
| Fetid Marsh, east side of K5/west side of L5 | Hidden map exit(s) | 10 Perception | secret camp with Signed Arena Ticket and "ArenaNow" Broadcasting Schedule oddities and Slimy Tablet Computer |
| Fetid Marsh, SW corner of K4 | Hidden pool jumps | 12 Perception | secret platforms for easier jumping across leper pool |
| Giant Creeper Lair (two maps east of the Nexus), NW corner | Hidden passages | 9 Perception | secret passages to/from hidden room, shortcut past creepers |
Heavy Duty
- This list is incomplete; you can help by expanding it.
| Location | Secret | Requirement | Details |
|---|---|---|---|
| Core City, Rag's Boutique | Hidden trap door | 11 Perception | Discover entrance to the basement |
| Core City, Rag's Boutique, basement | Discover contents behind the curtains | 13 Perception | Allows to target the auto-turrets without lifting the curtains |
| The Compound, outside, northern side of the map | Hidden metal plates | 10 Perception | Hidden high quality two random metal plates behind a fence |
| The Compound, entrance stairs | Hidden vent | 14 Perception | Leads to a blocked restroom that has a medical locker with Adrenaline Shot and Coagulation Shot |
| The Compound, entrance offices | Hidden safe | 12 Perception | Hidden locked safe containing around 100 charons and a Gold Ring |
| The Compound, exoskeleton assembler lab | Shelf back panel missing | 15 Perception | Secret passage behind a computer rack to the north, leads to a box with 3 Shock Bolts Mk III, 2 Plasma Grenades Mk III and a Laser Pistol |
| The Compound, Fusion Cannon lab | Hidden Plasma Cell | 9 Perception | Under a table in the south |
| The Compound, medical section 1 | Smaller box | 12 Perception | Hidden box inside a bigger box in the office, contains a vial of Aegis |
| The Compound, medical section 2 | Super Health Hypo | 11 Perception | Found under a desk near the med stations in eastern side of the map |
| The Compound, command, NW room | Hidden safe | 14 Perception | Hidden locked safe containing 3 Fusion Cells, 3 Shock Bolts Mk III, 4 Shock Bolts Mk II and a high quality Smart Module |
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