Corrosion Sentries
Work in Progress
- Major format overhaul
- Corrosion sentries [10] and [12] are bugged - workaround solution added
- DM or ping @lightbearer on the Discord for any corrections or feedback
Overview
Introduction
- The purpose of this page is to assist any players that are missing a corrosion sentry in their Cursed Wheel
- It is a mechanic that is poorly explained, but critical to the endings and access to the Rank 12 Bounty - Cyclops
- The "True" version of the Greater Warped One (GWO) can only be fought after registering all 13 Corrosion Sentries
Corrosion Mechanics
Corrosion
- Central mechanic of the Fortress with major changes to what areas are accessible depending on its level
- Increased when your party enters the field of view of a corrosion sentry
- Cannot be decreased while in the Fortress, but can be changed in the Cursed Wheel
- Fortress Appearance - Wall goo becomes more prominent with high corrosion
- Requests - Some requests become unavailable as essential NPCs are driven insane or die as a result of high corrosion, which affects what endings are available
- Monsters - Different monsters spawn, with stronger monsters at lower corrosion
- Greater Warped One - The Greater Warped One is much stronger at lower corrosion, gaining new abilities and increased damage and health
- Total of 13 corrosion sentries that appear as stationary flying enemies
- Stepping into their field of view sounds an alarm, increases the Fortress's corrosion level, and counts as a "Spotted" flag in the Cursed Wheel
- Corrosion sentries are not the same as standard floor sentries, which are simply powered-up normal enemies
Golems
- Golems walk forwards when activated, destroying traps, damaged walls, and sentries in their path until they reach a solid wall or door
- Golems are only available after reaching Zone 10 on a first run and acquiring the golem reversal power before fighting the GWO
Corrosion Sentry Registration
Requirements
-
To register a corrosion sentry the following must be true:
- "Spotted" at least once
- "Not Spotted" at least once
- Started at a Cursed Wheel node BEFORE encountering the corrosion sentry on the normal progression path AND made it to the next Cursed Wheel node without exiting, wheeling, or "accepting death"
Flag Definitions
- "Spotted" = Entering a corrosion sentry's field of view
- "Not Spotted" = Moving past a corrosion sentry without entering its field of view, which requires the golem reversal power
- The "Spotted" and "Not Spotted" designations are hidden flags the game tracks.
- The flags are only permanently saved after reaching the next Cursed Wheel node along the normal progression route.
- During a first run you will be automatically "Spotted" by every corrosion sentry in order to progress. A small number of corrosion sentries are located in areas that cannot be accessed until the overall Abyss corrosion level is lowered
- The golem reveral power can be used to block a corrosion sentry's field of view or crush them outright. Note that normal sentries have no effect on flags, registration, or the Abyss corruption level
Node Definitions
- Start node
- The node you wheel to first at the beginning of the process
- The game requires a fresh encounter with the corrosion sentry for its flags to update
- Register node
- Node where you end a run and update any flags
- Node that the corrosion sentry is listed under when it becomes available in the Cursed Wheel
- Note that you can never register a corrosion sentry by wheeling to its own node as the starting point
- Flags need to be triggered using the correct starting and ending Cursed Wheel nodes
- The guide uses "Start" and "Register" nodes throughout
Putting it All Together
- Each corrosion sentry requires a separate run (Start node > Register node) for each flag ("Spotted" and "Not Spotted")
- Once both flags are registered correctly the corrosion sentry will appear in the Cursed Wheel
- Corrosion sentries in the Cursed Wheel can be toggled ("Spotted" or "Not Spotted") to manipulate the Fortress's overall corrosion level
Corrosion Sentry Guide
Topics Covered
Summary
- Locations of all 13 corrosion sentries
- Pathing instructions for confusing areas with all steps based on the cardinal directions of the map
- Golem power reversal directions
- Registration nodes and directions for "Spotted" and "Not Spotted" runs
- Important time-saving tips, warnings, and other notes
- Picture of the Cursed Wheel entry
Notes
- A few of the Cursed Wheel nodes have more than one corrosion sentry. These corrosion sentries have an additional prefix ("2F North" Corrosion Sentry) to distinguish them from each other.
- The guide is structured as a series of nested drop-down menus that can be kept open or collapsed. Each entry has a [#] that follows the order of appearance in the Cursed Wheel.
Secret Passage Minor Harken
Corrosion Sentry [1]
Cursed Wheel Registration
- Automatically "Spotted" on first run
Cursed Wheel
- Start: Hidden Passage (Beginning of Zone 1)
- Register: Secret Passage Minor Harken (Zone 1 Harken)
Directions
- From Hidden Passage walk the full length of Zone 1 until you reach the corrosion sentry in the bottom left-hand corner. Its location does not change even with different map variations
- Push the golem to the right > "Not Spotted" flag triggered
- To register exit via the Zone 1 Harken (Secret Passage Minor Harken)
Enshadowed Well of Life
Important Notes for [2]-[4]
- Corrosion sentries [2], [3], and [4] can all be registered in the same run
- Registering [3] and [4] requires defeating the Necrocore boss located at the end of Zone 3
- For under-leveled or -geared players it is recommended to carry a Hook of Harken
Corrosion Sentry [2]
Cursed Wheel Registration
- Automatically "Spotted" on first run
Cursed Wheel
- Start: Secret Passage Minor Harken (Zone 1 Harken)
- Register: Enshadowed Well of Life (Zone 2 Fountain)
Directions
- The end goal is a drop-down hole located in the NE corner of Zone 2
- Push the golem to the left > "Not Spotted" flag triggered
- To register proceed to the Zone 2 Fountain (Enshadowed Well of Life)
- To exit:
- Use a Hook of Harken
- Take the path back to the Zone 1 Harken
- Defeat the Necrocore boss to access the Zone 3 Harken
Notes
- Corrosion sentries [3] and [4] can be registered after reaching the Zone 2 Fountain
Path to Zone 1 Harken
- From the corrosion sentry [3] exit through the southern door
- Ignore the sentry to the immediate left and keep heading south. Turn right and pass 2 small dungeon cells. At the end of the path there is a dead-end with a drop-down hole to Zone 3
- Once you land in Zone 3 go left, up, right, up and take the stairs to Zone 2
- Head through the 1-way door. Take the stairs directly in front of you to return to the Zone 1 Harken and exit
Path to Zone 3 Harken
- From the Zone 2 Fountain follow the light blue and green paths
- The Necrocore boss must be defeated to access the Zone 3 Harken to exit
- Race: Undead
- Abilities: Instant-Death
- Necrocore is undead and requires Expulsion weapons to do full damage
-
Its "Spear of Doom" attack can insta-kill an adventurer. To increase insta-kill tolerance:
- Gear (Helm of Malice, Skull Necklace)
- Bondmates (Elequon)
- Adventurer passives (Red Beard, Galina)
- Harken blessings
- Well of the Mind nodes for the MC
Secret Path Keeper Vanquished
Important Notes for [3] and [4]
- Registering corrosion sentries [3] and [4] requires defeating the Necrocore boss located at the end of Zone 3
- Corrosion sentry [4] must be registerd twice for both "Spotted" and "Not Spotted"
- Corrosion sentry [4] requires a low Abyss corrosion level to access. Toggle all the corrosion sentries to "Not Spotted" in the Cursed Wheel beforehand
- Corrosion sentries [3] and [4] can be registered in the same run
South Corrosion Sentry
South Corrosion Sentry [3]
Cursed Wheel Registration
- Automatically "Spotted" on first run
Cursed Wheel
- Start: Enshadowed Well of Life (Zone 2 Fountain)
- Register: Secret Path Keeper Vanquished (Zone 3 Necrocore boss defeated)
Directions
- From the Zone 2 Fountain head south through the door and follow the path to the right to the large room
- Ignore the golem directly in front of you
- Head south and approach the corrosion sentry carefully as it has a large field of view
- Push the southern golem to the left > "Not Spotted" flag triggered
- The golem only partially blocks the corrosion sentry's field of view and you can still be "Spotted"
- To register defeat the Necrocore boss (Secret Path Keeper Vanquished) located at the end of Zone 3
- To exit use the the Zone 3 Harken
Notes
- To the north is corrosion sentry [4] that can be registered in the same run
Path to Necrocore
- From the Zone 2 Fountain follow the light blue and green paths
Fight Details
- Race: Undead
- Abilities: Instant-Death
- Necrocore is undead and requires Expulsion weapons to do full damage.
-
Its "Spear of Doom" attack can insta-kill an adventurer. To increase insta-kill tolerance:
- Gear (Helm of Malice, Skull Necklace)
- Bondmates (Elequon)
- Adventurer passives (Red Beard, Galina)
- Harken blessings
- Well of the Mind nodes for the MC
Central Corrosion Sentry
Central Corrosion Sentry [4]
Cursed Wheel Registration
Cursed Wheel
- Start: Enshadowed Well of Life (Zone 2 Fountain)
- Register: Secret Path Keeper Vanquished (Zone 3 Necrocore boss defeated)
Directions
- From the Zone 2 Fountain head south through the door and follow the path to the right to the large room
- Ignore the golem directly in front of you and head north. The corruption sentry is in an alcove in the upper right-hand corner
- Stand in its field of view > "Spotted" flag triggered
- To register defeat the Necrocore boss (Secret Path Keeper Vanquished) located at the end of Zone 3
- To exit use the the Zone 3 Harken
Notes
-
To the south is corrosion sentry [3] that can be registered in the same run
Potential Exploit
- Some players have reported a bug that can trigger the "Spotted" flag without defeating the Necrocore boss
- Steps
- Wheel to Enshadowed Well of Life (Zone 2 Fountain), get "Spotted", and then exit via a Hook of Harken or the Zone 1 Harken
- Once back in town wheel to Secret Path Keeper Vanquished and then exit via the Zone 3 Harken
- Do a "Not Spotted" run to see if the corrosion sentry appears in the Cursed Wheel
- The bug may have been patched, so proceed at your own risk
Cursed Wheel
- Start: Enshadowed Well of Life (Zone 2 Fountain)
- Register: Secret Path Keeper Vanquished (Zone 3 Necrocore boss defeated)
Directions
- From the Zone 2 Fountain head south through the door and follow the path to the right to the large room
- Push the golem directly in front of you up > "Not Spotted" flag triggered
- To register defeat the Necrocore boss (Secret Path Keeper Vanquished) located at the end of Zone 3
- To exit use the the Zone 3 Harken
Notes
- To the south is corrosion sentry [3] that can be registered in the same run"
Path to Necrocore
- From the Zone 2 Fountain follow the light blue and green paths
Fight Details
- Race: Undead
- Abilities: Instant-Death
- Necrocore is undead and requires Expulsion weapons to do full damage.
-
Its "Spear of Doom" attack can insta-kill an adventurer. To increase insta-kill tolerance:
- Gear (Helm of Malice, Skull Necklace)
- Bondmates (Elequon)
- Adventurer passives (Red Beard, Galina)
- Harken blessings
- Well of the Mind nodes for the MC
Fortress Lower Floors Cleared
Corrosion Sentry [5]
Golem Directions
- Push the bottom (1) golem to the right to block the corruption sentry's field of view
- Push the top (2) golem up to block the sentry's field of view
- Danger! There is a sentry (blue ★) directly north of the corrosion sentry"
Cursed Wheel Registration
- Automatically "Spotted" on first run
Cursed Wheel
- Start: Fortress Basement Arrival (Zone 5 entrance)
- Register: Fortress Lower Floors Cleared (enter Zone 6)
Directions
- Proceed through Zone 5 until you reach the corrosion sentry. Its location does not change even with different map variations
- Push the bottom golem to the right to block the corruption sentry's field of view > "Not Spotted" flag triggered
- Push the top golem up to block the sentry's field of view
- To register go up the stairs to Zone 6 (Fortress Lower Floors Cleared)
- To exit go back downstairs and use the Zone 5 Harken
Notes
- Danger! There is a sentry directly north of the corrosion sentry
- The registration node is entering Zone 6 not the Zone 5 Harken to avoid exiting prematurely
Portrait Gallery Minor Harken
Corrosion Sentry [6]
Golem Directions
- Push the top (1) and bottom (2) golems to the left
- Push the middle (3) golem up to crush the corrosion sentry
- Danger! There are 2 sentries (blue ★) in the area
Cursed Wheel Registration
- Automatically "Spotted" on first run
Cursed Wheel
- Start: Fortress Lower Floors Cleared (Zone 6 entrance)
- Register: Portrait Gallery Minor Harken (Zone 6 Harken)
Directions
- Proceed through Zone 6 until you reach the area with 3 golems. Its location does not change even with different map variations
- Push the top and bottom golems to the left to clear the path for the middle golem
- Push the middle golem up, which will crush the corrosion sentry > "Not Spotted" flag triggered
- To register head up and to the right to exit via the Zone 6 Harken
Notes
- Danger! There are 2 sentries in the area
Ghosts of Yore Vanquished
Corrosion Sentry [7]
Golem Directions
- The corrosion sentry room can be rotated 90 degrees depending on the map variation
- The golem push order remains the same
- Danger! There are 3 sentries in the area
Cursed Wheel Registration
- Automatically "Spotted" on first run
Cursed Wheel
- Start: Portrait Gallery Minor Harken (Zone 6 Harken)
- Register: Ghosts of Yore Vanquished (Doll boss defeated)
Directions
- From the Zone 6 Harken go up the stairs and proceed through Zone 7 until you reach the large room with 6 golems
- Zone 7 can roll different map variations. The large room might be rotated, but the golem pushing order remains the same
- Crush the corrosion sentry > "Not Spotted" flag triggered
- To register proceed to the end of Zone 7 and defeat the Doll boss (Ghosts of Yore Vanquished)
- To exit use the Zone 7 Harken
Notes
- Danger! There are 3 sentries in the large room with the corrosion sentry"
- Alternative Doll kill method:
- Fighting the Doll boss again is not mandatory
- It can be crushed with a golem for a hidden achievement
Fortress 2F Minor Harken
Important Notes for [8] and [9]
- To register corrosion sentries [8] and [9] you must do the entire route from the Zone 7 Harken (Ghosts of Yore Vanquished) to the Zone 9 Harken (Fortress 2F Minor Harken) without exiting, wheeling, or "accepting death"
- Corrosion sentry [9] is encountered before [8], but are listed in the opposite order in the Cursed Wheel
- Scroll down and start with corrosion sentry [9] first
- Both corrosion sentries can be registered at the same time to avoid multiple runs
2F North Corrosion Sentry
2F North Corrosion Sentry [8]
Golem Directions
- Push the top (1) golem to the right to block the sentry's field of view
- Push the bottom (2) golem down to create a new drop-down hole
- Danger! There is a sentry (blue ★) in the upper right-hand corner
Cursed Wheel Registration
- Automatically "Spotted" on first run
Cursed Wheel
- Start: Ghosts of Yore Vanquished (Zone 7 Harken)
- Register: Fortress 2F Minor Harken (Zone 9 Harken)
Directions
- From the Zone 7 Harken proceed through the Fortress (Zones 8-10) until you reach Zone 10, which has a fixed map layout
- The final room in Zone 10 has 2 golems, a sentry, and a drop-down hole in the bottom-left corner
- Push the top golem to the right to block the sentry's field of view
- Push the bottom golem down to create a new drop-down hole to Zone 9
- Drop down the new hole and you will land behind the corrosion sentry > "Not Spotted" flag triggered
- To register go to the Zone 9 Harken on the other side of the hallway and exit
Notes
- Danger! There is a sentry in the upper right-hand corner
- Warning! Do not use the bottom-left drop-down as you will be "Spotted" when you land
3F West Corrosion Sentry
3F West Corrosion Sentry [9]
Golem Directions
- Push the golem to the right to break the wall to access the adjacent room
- The next room has the automaton and mini-quest
Cursed Wheel Registration
- Automatically "Spotted" on first run
Cursed Wheel
- Start: Ghosts of Yore Vanquished (Zone 7 Harken)
- Register: Fortress 2F Minor Harken (Zone 9 Harken)
Directions
- From the Zone 7 Harken proceed through Zones 8-10 until you reach Zone 10, which has a fixed map layout
- North of the stairs to Zone 9 there will be a room with a golem in it. Push the golem to the right to break the wall
- In the adjacent room examine the skeleton, which will spawn an automaton and a map on the floor nearby
- The map marks the locations of 3 winding keys on the previous floors (Zones 8 and 9)
- Return to Zone 10 after collecting the winding keys and interact with the automaton
- Exit the room and walk into the hallway with the corrosion sentry. The automaton will activate and the corrosion sentry will give chase > "Not Spotted" flag triggered
- To register continue north to the last room in Zone 10, drop down the hole to Zone 9, and exit via the Zone 9 Harken (Fortress 2F Minor Harken) across the hallway
Notes
- Danger! Do not enter the hallway with the corrosion sentry to avoid being "Spotted
- Corrosion sentry [8] can be registered in the same run in the last room in Zone 10
Mini-Quest: Winding Keys
- The locations of the 3 winding keys are marked on your map with a yellow "!" symbol
- The keys are always in the same location (tile set) even with different map variations
- There are 2 keys in Zone 8 and 1 key in Zone 9
Fortress 3rd Floor Arrival
Critical Bug - READ ME
- Corrosion sentries [10] and [12] CANNOT be registered properly at the Zone 10 Fountain (Fortress 3rd Floor Arrival)
- To register:
- Toggle your Cursed Wheel for the GWO 8 (Blackmail) or GWO 6 (Mastermind) version of the fight
- Wheel to the Zone 9 Harken (Fortress 2F Minor Harken)
- Ignore both their rooms > "Not Spotted" flag triggered
- Reach and defeat the GWO
- Update: Discord members have reported that reaching the GWO fight is sufficientp; kill the MC, "accept death", and see if it registered properly
- The best time to do this is during the Blackmail ending since you will have encountered both and can ignore them on your way to the GWO
- The guide sections of [10] and [12] have been updated to reflect the critical bug
Important Notes for [10]-[13]
- To register corrosion sentries [11] and [13] you must do the entire route from the Zone 9 Harken (Fortress 2F Minor Harken) to the Zone 10 Fountain (Fortress 3rd Floor Arrival) without exiting, wheeling, or "accepting death"
- These will be registered properly when you do [10] and [12] as long as you are "Not Spotted", which means there is no need to do a separate run for them
- Corrosion sentries [10]-[13] are the most time-intensive to register
- Corrosion sentries [10] and [12] are not accessible on a first run and are tied to requests related to the endings:
- Corrosion sentry [10]: Search for the Missing Girl
- Corrosion sentry [12]: Blackmail Resolution
- For corrosion sentries [11] and [13] you will be "Spotted" on a first run. You can include their "No Spotted" runs when registering corrosion sentry [10] and [12] as previously noted
1F Servant's Quarters Corrosion Sentry
1F Servant's Quarters Corrosion Sentry [10]
Cursed Wheel Registration
Cursed Wheel
- Start: Fortress 2F Minor Harken (Zone 9 Harken)
- Register: Triumphant Return (Blackmail or Mastermind ending)
Directions
- Visiting this room is required to complete the Search for the Missing Girl request
- Inspect the bookcase and pick up the Tattered Rag (Valuable) > "Spotted" flag triggered
Warning
- It remains unclear if the "Spotted" registration node is the Zone 10 Fountain or Triumphant Return (Blackmail or Mastermind ending)
- Recommend that you do not waste time trying to defeat the GWO until AFTER you have done a "Not Spotted" run
- If it does not appear in the Cursed Wheel after a "Not Spotted" run, then come back and try it again
- To exit head to the Zone 10 Fountain and then southern teleport to warp to the Zone 9 Harken
Cursed Wheel
- Start: Fortress 2F Minor Harken (Zone 9 Harken)
- Register: Triumphant Return (Blackmail or Mastermind ending); see "Critical Bug" note
Directions
- When you drop-down to Zone 8 do NOT enter the room > "Not Spotted" flag triggered
- To register you must head to the Zone 10 Fountain (do NOT exit) and then fight GWO 6 (Mastermind ending) or GWO 8 (Blackmail ending) as the registration node is Triumphant Return
Notes
- Corrosion sentry [12] (2F Soldier's Room) also requires a separate "Not Spotted" run where you ignore the corrosion sentry and do not enter its room. It is recommended to do both at the same time
1F Southwest Corrosion Sentry
1F Southwest Corrosion Sentry [11]
Golem Directions
- Push the middle golem (1) down
- Push the left-hand golem (2) to the right, which will crush the corrosion sentry
- Push the far right-hand golem (3) down, which will break a wall and allow access to the Zone 9 stairs
- Danger! There are 3 sentries (blue ★) in the area
Cursed Wheel Registration
- Automatically "Spotted" on first run
Cursed Wheel Nodes
- Start: Fortress 2F Minor Harken (Zone 9 Harken)
- Register: Fortress 3rd Floor Arrival (Zone 10 Fountain)
- Does not appear to be affected by the "Critical Bug" and should register properly
Directions
- From the Zone 9 Harken go south and follow the path to Zone 8
- Proceed to the end of Zone 8. This room has a fixed location and will always be in the bottom-left corner
- See Golem Directions to crush the corrosion sentry > "Not Spotted" flag triggered
- Exit the room through the newly created hole in the wall
- To register continue through Zone 9 to the Zone 10 Fountain (Fortress 3rd Floor Arrival)
- To exit use the southern teleport tile in Zone 10 to warp to the Zone 9 Harken
Notes
- Danger! There are 3 sentries in the room with the corrosion sentry
2F Soldier's Room Corrosion Sentry
2F Soldier's Room Corrosion Sentry [12]
Cursed Wheel Registration
Cursed Wheel
- Start: Fortress 2F Minor Harken (Zone 9 Harken)
- Register: Triumphant Return (Blackmail or Mastermind ending)
Directions
- Visiting this room is required to complete the Blackmail Resolution request
- Upon entry you will be immediately "Spotted" and have to fight an Evil Eye
Warning
- It remains unclear if the "Spotted" registration node is the Zone 10 Fountain or Triumphant Return (Blackmail or Mastermind ending)
- Recommend that you do not waste time trying to defeat the GWO until AFTER you have done a "Not Spotted" run
- If it does not appear in the Cursed Wheel after a "Not Spotted" run, then come back and try it again
- To exit head to the Zone 10 Fountain and then southern teleport to warp to the Zone 9 Harken
Cursed Wheel
- Start: Fortress 2F Minor Harken (Zone 9 Harken)
- Register: Triumphant Return (Blackmail or Mastermind ending); see "Critical Bug" note
Directions
- Do not enter this room as move down the Zone 9 hallway to the Zone 8 drop-down point
- To register you must head to the Zone 10 Fountain (do NOT exit) and then fight GWO 6 (Mastermind ending) or GWO 8 (Blackmail ending) as the registration node is Triumphant Return
Notes
- Corrosion sentry [10] (1F Servant's Quarters) also requires a separate "Not Spotted" run where you ignore the corrosion sentry and do not enter its room. It is recommended to do both at the same time
2F Imprisoning Trap Corrosion Sentry
2F Imprisoning Trap Corrosion Sentry [13]
Golem Directions
- Push the golem (1) closest to the room entrance to the right onto the switch
- Go into the next room and push the golem (2) up to break the wall
- Push the golem (3) in this room to the left to crush the corruption sentry
- Push the final golem (4) to the left to open the door to the switch room
-
Flip the switch and all the remaining doors will unlock
-
Danger! There is a sentry (blue *) in the room
- Warning! This room might be rotated, but the pushing order remains the same. Use the entrance door as a reference point
Cursed Wheel Registration
- Automatically "Spotted" on first run
Cursed Wheel
- Start: Fortress 2F Minor Harken (Zone 9 Harken)
- Register: "Fortress 3rd Floor Arrival" (Zone 10 Fountain)
- Does not appear to be affected by the "Critical Bug" and should register properly
Directions
- From the Zone 9 Harken proceed through Zones 8 and 9 until you encounter the "imprisoning room"
- The location of this room in Zone 9 can change due to different map variations, but it cannot be missed
- See Golem Directions to crush the corrosion sentry > "Not spotted" flag triggered
- To register continue through Zone 9 to the Zone 10 Fountain
- To exit use the southern teleport tile in Zone 10 to warp to the Zone 9 Harken
Notes
- Danger! There is a sentry in the corruption sentry room















































