Hell is Us

Searching for the Keystone of Terror Walkthrough

Hell is Us Walkthrough Team

Last updated on: September 17, 2025 05:04 AM

Searching for the Keystone of Terror

This is a walkthrough for Searching for the Keystone of Terror, an investigation in Hell is Us. Learn more about how to complete Searching for the Keystone of Terror, its points of interest, and its Exploration points here!

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Full Exploration List
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Searching for the Keystone of Terror Walkthrough

Searching for the Keystone of Terror Objectives
1. Learn About the Symbol of the Screaming Face 2. Find Clues About the Blood Queen in Marastan 3. Reach the Blood Queen's Tomb 4. Enter the Tower in Senedra Forest 5. Close the Timeloop and Defeat the Boss

1. Learn About the Symbol of the Screaming Face

	Objectives
1.1	Return to the APC and ask Tania about the Symbol of the Screaming Face. Then, travel to Talju via the Navigation Computer. This triggers a cutscene that transports you to Talju once it ends.
1.2	Look up to see Boro's autoshop sign and head towards it, which is located past the abandoned cars in front of the APC. Be careful of the enemies along the way, especially the Protector at the end with a Haze of Grief!
1.3	Enter the building next to the gas station and head to the room on the right to reach the garage. Talk to the Sheltered Mechanic, Boro Juven, and ask him about Caspian Fran's whereabouts to receive the Map of Talju.
1.4	Return to the APC and follow the path behind it toward the town. Take the left path and continue forward until you reach the Town Hall. Pick up the Signal Flares near the sandbag blockade, as they are used to complete the Good Deed, A Light in the Dark. Enter the Town Hall and talk to Caspian near the front desk, ask him about the symbol, and he will ask you to look for his son, giving you a Walkie-Talkie after the conversation ends.
1.5	Backtrack to the town entrance, then take the path to the right and head north. Turn right again to reach the school. Lukhan can be found in the maintenance room behind the school. Be sure to exhaust all dialogue options to learn more about him.
1.6	Trade the Walkie-Talkie with Lukhan, which triggers a cutscene. Return to the Town Hall and speak with Caspian. Ask him about the symbol to receive the Parking Lot Key and your next objective, which is to defeat the enemy in the parking lot for them to access the ON truck and escape. Before you defeat the enemy in the parking lot, complete A Light in the Dark to get Boro out of the way in the Autoshop. On the table behind him you can find a photo of Sam the dog. This will complete his data in the Investigation Chart.
1.7	From the Town Hall, head to the western area of the town to reach the parking lot booth, the same path you took earlier to reach the school but before the structure with the hanging bodies. Use the key to open the booth and gain access to the computer inside. Open the gate using the computer. Head inside and defeat the Timeloop Guardian.
1.8	Use the back entrance to unlock a shortcut back to the Town Hall, then talk to Caspian and ask him about the Symbol of the Screaming Face and the Blood Queen, which unlocks the ability to travel to Marastan via the APC.
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2. Find Clues About the Blood Queen in Marastan

	Objectives
2.1	Travel to Marastan and look up to see a church. Follow the upward path past the enemies to reach the town. Turn left after passing the Soaring Eagle restaurant and reach the Marastan Market building.
2.2	Climb the ladder and speak with Talis on the Marastan Market balcony to receive the task of eliminating the enemies near the church entrance. He will also give you the Key - Statue. Once you have it, head to the church.
2.3	Defeat the enemies near the church, ignoring the Artillery Walker on the rooftop of Keol and Sons' shop, as it's not part of the task. Return to Talis to afterward to receive the gate key to the Blood Queen's Observatory.
2.4	From Maristan Market, head south past a couple of establishments and houses, then turn right. You should see the Blood Queen's statue at this point. Use the key you got from Talis to unlock the gate to the Blood Queen's Observatory. Defeat the Protector along the path and enter the cave system.
2.5	Upon entering the cave, take the left path to head towards the statue. Continue following the path with lights until you reach a ladder.
2.6	Climb up and reach the Blood Queen's hollowed head. Scan the mural to receive clues for the next puzzle. Interact with the telescope to find out where the Blood Queen's tomb is.
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3. Reach the Blood Queen's Tomb

	Objectives
3.1	Return to the town and follow the same path you took from the APC. Head downhill and turn right to reach the cemetery, where you should see the six eagle statues inside.
3.2	Solve the eagle statue puzzle by rotating all six statues to face east. Use your compass to check if they are facing the correct direction. Completing the puzzle opens up a way down to the tomb. ▶︎ Marastan Graveyard Eagle Puzzle Guide
3.3	Enter the tomb and go through a series of narrow hallways and collect the Square, Oblique, and Angled Tablet Fragments. Travel back to the APC via the save point near the entrance to the tomb.
3.4	From the APC, take the path on the right towards the Hanging Coffins touristic site. Cross the wooden bridge and take the path on the right upon reaching an intersection. Continue forward past a couple of enemies until you reach the huge structure. Defeat the Protector Walker within the area.
3.5	To activate the puzzle, insert the matching Tablet Fragments into the pillars. Align the symbols on the pillars with the corresponding symbols on the floor to open the entrance. Defeat the enemy that comes out and proceed inside. ▶︎ Marastan Door Puzzle Guide
3.6	Inside, you will encounter a horde of enemies. Lure them toward the entrance, where the narrow path will allow you to defeat them one by one and avoid being overwhelmed from all sides.
3.7	Afterwards, solve the puzzle inside by revealing the symbols: Crossed Swords, Crown, Eye, and Tower. Note that the Crown and the Tower each have two different designs. Check the murals to determine which symbol you should input. Collect the Sword of the Blood Queen and the Queen's Eulogy afterwards. ▶︎ Marastan Symbols Puzzle Guide
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4. Enter the Tower in Senedra Forest

	Objectives
4.1	Return to the APC and travel to Senedra Forest. Make sure to have consumables that restore your HP, as you'll need it to solve puzzles inside the tower. Go to the northeast most area of the map to where the the tower, also known as Arcas Spire, is. Insert the Sword of the Blood Queen to unlock the entrance.
4.2	Follow the path and exit through the door that leads to an open area. Go to the other side to reach another door and go outside through the other exit. Head down past the ruined pillar and continue forward past the Protector Walker to reach a flight of stairs.
4.3	Upon reaching the top of the stairs, fight through the huge horde of enemies until you reach to the wooden scaffolding. Turn right and you'll find a save point along the path.
4.4	Past the save point, enter the room with a ladder leading downward. Continue descending through the ladders until you reach an area filled with skeletons. Follow the wooden path from there until you arrive at the elevator.
4.5	Head down the stairs to the right and follow the path while defeating enemies along the way. At the end of the path is a skeleton with the Gear - Spire.
4.6	Go back to the elevator and insert the gear in the mechanism below the elevator. Head up and pull the lever to move up the tower. Follow the path and fight through the hordes of enemies in the hallway. At the end of the hallway, turn right and enter another room with another horde.
4.7	Face east and climb the spiral staircase and exit to a wooden scaffolding. Head down to reach the grand staircase, and go up, where another horde awaits. Be careful of the hole in the grand staircase, as there are enemies if you fall into it!
4.8	Enter the next room and pass through the door to reach a hallway with a pressure plate past the pillar with the Blood Queen's head sculpture. Step on it and endure the spike damage to proceed to the next area.
4.9	In the next room, head up the stairs in front of you and turn left. Pass through the open room beside the stairs and exit to the other end. Then, step on the pressure plate labeled A1. Quickly return to the main area through the open passage behind you, and pull the Tower lever. ▶︎ Arcas Spire Tile Puzzle Guide
4.10	Next, head up the stairs in front of you and turn right. Step on the prssure plate labeled B2 located just beside the stairs. This opens up a room filled with enemies, but ignore them and quickly return to the main area through the open passage by the stairs, and pull the Skull lever.
4.11	Finally, head up the stairs in front of you and turn right, then climb the stairs up to the topmost floor. Step on the prssure plate labeled F4. Quickly head down the stairs all the way to the area with the levers while dodging the enemies.Pull the Twin-headed Snake lever, and this will open the door on the top-most floor.
4.12	Proceed through the room and climb a long flight of stairs until you reach the top with a save point. Interact with the door to open it and receive an Advanced Lymbic Forging book and an Amine Prism - Theta and Rho.
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5. Close the Timeloop and Defeat the Boss

	Objectives
5.1	Exit outside through the door and you'll find a timeloop in the middle of the area. Head down the stairs and turn left, hug the wall until you see some stairs near the wooden scaffolding. Once you're on the second level, return towards the large staircase from where you exited, and defeat the Timeloop Guardian nearby.
5.2	Head down and proceed onwards until you reach the other side of the timeloop. Defeat the Timeloop Guardian near the timeloop itself to progress.
5.3	From the timeloop, proceed forward towards the staircase you exited out of while hugging the wall. Climb the stairs by the wall to reach the second level, and proceed forward until you reach the Artillery Walker Timeloop Guardian by the wooden scaffolding. Defeat it and head to the timeloop.
5.4	Enter the timeloop and interact with your drone. Select the Amine Prism - Theta, obtained from the previous door, to place it into the timeloop to collapse it.
5.5	Interact with the gold item on the ground and face the Terror Haze Boss. Defeat the Boss by approaching the glitching pillars to make it spawn. Once it does, attack until its health bar is depleted. Afterwards, you’ll obtain the Keystone of Terror. Return to the APC and ask Tania about the Symbol of the Charioteer to unlock Jeljin.
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Searching for the Keystone of Terror Full Exploration List

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List of All Items	Timeloops
Amine Prisms	Mysteries and Good Deeds

List of All Items

Talju

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✔️	Item	How to Get
	Diary - Crazy Week	Exploration Item Found of a corpse in Talju. Used as a hint for Supply Chain Mystery.
	Key - Parking Lot	Investigation Item Obtained from Caspian Fran in Talju. Used to open the parking lot in Talju.
	Key - Pharmacy	Investigation Item Found on a corpse in Talju. Used to open the Pharmacy.
	Lymbic Rod - Rage, Z	Exploration Item Found inside Caspian's Basement in Talju. Used to open Lymbic Chests and Lymbic Doors.
	Map - Senedra Mountains	Exploration Item Found on a corpse in Talju. Give to the Trapped Woman in Senedra Forest.
	Map of Talju	Investigation Item Obtained from the first NPC you talk to in Talju. Used to locate the house of Caspian Fran.
	Note - Cryptic Clue (Talju)	Exploration Item Found in a bus stop in Talju.
	Pill Bottle - Metformin	Exploration Item Found in a medical clinic in Talju. Given to the stranded ON Soldier in Acasa Western Monument.
	Signal Flare x4	Exploration Item Found in a military supply creat in Talju. Given to the four survivors in Talju.
	Symbol - Flame	Exploration Item Found on a corpse in Talju. Open locked bunker in Senedra Forest.
	Walkie-Talkie	Investigation Item Obtained from Caspian Fran in Talju. Give to Lukhan Fran.
	Worn Journal	Research Item Found in Talju.
	Zoom Lens	Exploration Item Found in a destroyed photography shop in Talju. Deliver to the Hermit in Acasa Marshes.

Marastan

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✔️	Item	How to Get
	Children's Book	Research Item Found in Marastan.
	Citizen's File	Research Item Found in a shed in Marastan.
	Fuse	Exploration Item Found in a mechanic's shop in Marastan. Used to restore power to the houses in Marastan.
	Gas Canister	Exploration Item Found at the docks below the town of Marastan. Trade with Korio Della in Marastan.
	Key - Antenna	Exploration Item Found on a soldier's corpse in the Marastan woods. Used to shutdown the transmissioned message.
	Key - Marastan Church	Exploration Item Found in the caves near the town of Marastan Used in the Graveyard at Marastan.
	Key - Statue	Investigation Item Obtained from the caretaker, Talis Arthiom, in Marastan. Used to access the Blood Queen observatory.
	Keys - Samo's Spare	Exploration Item Found in the general store in Marastan. Give to Dorno Grisibel.
	Letter - Getting Out	Exploration Item Found in an abandoned house in Marastan. Hints at where to bring the Urn in Marastan
	Lymbic Rod - Rage, Y	Exploration Item Found in Marastan. Used to open Lymbic Chests and Lymbic Doors.
	Lymbic Rod - Terror, V	Exploration Item Found in the crypts below Marastan. Used to open Lymbic Chests and Lymbic Doors.
	Note - Cryptic Clue (Marastan)	Exploration Item Found in the market of Marastan.
	Note - Tithe	Exploration Item Found in the caves near the town of Marastan.
	Scroll - Queen's Eulogy	Investigation Item Found in the sarcophagus of the Blood Queen in Marastan. Used to unlock the Arcas Spire
	Sword of the Blood Queen	Investigation Item Found in the sarcophagus of the Blood Queen in Marastan. Unlocks the Arcas Spire in Senedra Forest.
	Tablet Fragment - Angled	Investigation Item Found in the crypts below Marastan. Unlock the Door in Marastan Ruins.
	Tablet Fragment - Oblique	Investigation Item Found in the crypts below Marastan. Unlock the Door in Marastan Ruins.
	Tablet Fragment - Square	Investigation Item Found in the crypts below Marastan. Unlock the Door in Marastan Ruins.
	Urn	Exploration Item Found in Marastan. Show to Edwyn Tosan.
	Wooden Horse Figurine	Research Item Found inside the catacombs in the secret underground area, at a Marastan graveyard.

Arcas Spire

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✔️	Item	How to Get
	Advanced Lymbic Forging	Investigation Item Found in the Arcas Spire. Give to Victor Gaz.
	Crown of Bones	Research Item Found at the top of Arcas Spire.
	Faded Parchment	Research Item Found in Arcas Spire.
	Gear - Spire	Investigation Item Found in the Arcas Spire. Used to complete the elevator in the Arcas Spire.
	Jewelled Dagger	Research Item Found in Arcas Spire.
	Key - Brass	Exploration Item Found in the Arcas Spire. Used to open a locked chest in Arcas Spire.
	Key - Rusted (Arcas Spire Timeloop)	Investigation Item Found on a balcony of the Arcas Spire. Used to open a door in the Arcas Spire.
	Key - Rusted (Arcas Spire)	Exploration Item Found in the Arcas Spire. Unlocks a Chest in Arcas Spire
	Keystone of Terror	Investigation Item Found inside the Arcas Spire Used in the Lymbic Forge.
	Scroll - General Aarlon's Note	Investigation Item Found atop the Arcas Spire. Used to locate the Keystone of Terror

List of All Items