Main Quest Video Guide
Step 1
Pack-A-Punch & the Free Raygun Mark II
Activate Pack-A-Punch. You'll need to build all 3 Raygun Mark II Variants over the course of this quest.
Kill a Scientist Zombie in the Mainframe Chamber or Security Overlook on round 10 or later, and grab the Floppy Disk it drops.
Place the Floppy Disk in the computer in East Foyer. Interact with the Fax Machine to print a piece of paper with a 4-letter word on it.
In the Nursery, there's a chalkboard with letters separated into groups. For each letter of your word, count how many letters are in that letter's group — that count becomes a digit of your code.
Enter the resulting code into the computer in the Bunker to unleash a Doppelghast. Killing it drops a severed Arm — pick it up.
Use the Arm on the scanner in the Armory to unlock the Raygun Mark II — grab it.
Example
If your word is "CRAB" and the letters C and A are in groups of 4 letters while R and B are in groups of 6 letters, your code would be 4646.
Build
Raygun Mark II Canisters
There are 3 ways to get an Empty Canister — you'll need one for each of the 3 Raygun Mark II variants below:
- Destroy Blue Rocks around the map using the Raygun Mark II until an Empty Canister drops.
- Use a Kazmir outside the barricade below Double Tap to pull in and grab an Empty Canister.
- Use a Throwing Axe to burst the pipes on the wall in the Service Tunnel, following the pipe that corresponds to the letter next to the glass container in the Mainframe Chamber. Then explode open that glass container to grab an Empty Canister.
Build All 3
Raygun Mark II Variants
Each variant requires the base Raygun Mark II and an Empty Canister (see above). All 3 variants must eventually be built.
Obtain an Essence Bomb by breaking open white wooden boxes around the map.
Place the Essence Bomb on the rubble near the Level 3 Armor wallbuy in the Service Tunnel to the Serpent Mound.
Collect 2 Reflectors:
- Conservatory, in the fountain
- South West Balcony, in the fountain
Place the Empty Canister in the Serpent Mound.
Place the Reflectors in the Serpent Mound to reflect the light from the crystal onto one of the Doppelghast statues.
Melee the crystal to spawn a Doppelghast and kill it. Repeat for 3 total Doppelghasts, each from a separate statue.
After all 3 are killed, pick up the Light Canister from where you placed the Empty Canister.
Craft the Raygun Mark II Wraith Preservation on the workbench at the Doctor's Quarters.
Hit plant pods around the map with Explosive or Fire Lethals to get 4 seeds. Possible pod locations:
- Shem's Henge
- West Balcony, next to a tree
- Motor Court, to the left of the entrance to the Mansion
- Garden Pond, next to the staircase
- Motor Court
Place the Empty Canister in the Conservatory.
Place a seed into a harvester and defend it. Repeat this 3 more times (4 total).
After defending all 4 harvesters, pick up the Toxic Canister from where you placed the Empty Canister.
Build the Raygun Mark II Rot Blight at a Raygun workbench in the Garden Pond.
Place the Empty Canister on top of the stairs at Shem's Henge — this spawns one or more Abominations.
Get the Abomination(s) to shoot lightning at the 3 rocks to make them glow.
Have the Abomination(s) charge at the 3 rocks to make them float.
Defend the portal in the middle.
After defending the portal, grab the Explosive Canister from where you placed the Empty Canister.
Craft the Raygun Mark II Wraith Fire on the workbench at the Supply Depot.
Step 2
Complete the 3 Rituals
Complete 3 Rituals in any order. Each requires its matching Raygun Mark II variant and rewards a piece of the Sentinel Artifact needed for the boss fight.
Interact with the computer next to the painting in Banquet Hall and get kills to open the portal into the painting, using the Raygun Mark II Preservation.
Grab the Ritual Elixir on the table in the Liminal Banquet Hall.
Interact with 3 cups around the map and kill the Elder Disciples they spawn:
- Bottlery
- Garden Pond
- Overlook
After killing all 3 Elder Disciples, 3 sets of numbers spawn on the walls in the Banquet Hall.
Enter the numbers into the safe in West Hallways, in order from left to right.
Inside the safe is the Antler Carving — pick it up.
Place the Antler Carving on the pedestal in the Liminal Banquet Hall to start the ritual.
The boss's shield can only be destroyed by the Raygun Mark II Preservation. Kill the boss to end the ritual, then pick up the Sentinel Artifact piece.
Interact with the computer next to the painting in the Library and get kills to open the portal into the painting, using the Raygun Mark II Rot Blight.
Get 3 books while in Aether Shroud. There are 7 possible book locations across 3 types:
- ID Badge:
- East Foyer Fireplace
- Study Fireplace
- Banquet Hall Fireplace
- Audio Log:
- Library, on a couch
- Overlook, on a desk
- Ledger:
- Desk in upstairs East Foyer
- Study, on a desk
Activate the 3 books in the Library in the correct order to open the shelf to their left and reveal the Nuclear Plant Inspection Report.
Place the Nuclear Plant Inspection Report on the pedestal in the Liminal Library to start the ritual.
The boss's shield can only be destroyed by the Raygun Mark II Rot Blight. Kill the boss to end the ritual, then pick up the Sentinel Artifact piece.
Tip
It's easiest to find the correct book activation order through trial and error.
Grab the Sconce from in front of the elevator in the Banquet Hall.
Place the Sconce in the missing spot next to the big door in the Main Hall.
Interact with the two lamps by the door to play a Simon Says sequence until the big door opens.
Interact with the computer next to the painting in Distillery and get kills to open the portal into the painting, using the Raygun Mark II Wraith Fire.
Pick up a Bell in the Study — find it by breaking glass cabinets/TVs.
Place the Bell at the Bar in the upstairs Main Hall and ring it while you have a Brain Rot zombie — it will retrieve a Flask from the bar for you to pick up.
Place the Flask on the pedestal in the Liminal Distillery to start the ritual.
The boss's shield can only be destroyed by the Raygun Mark II Wraith Fire. Kill the boss to end the ritual, then pick up the Sentinel Artifact piece.
Tip
If you can't place the Bell at the Bar, enter the Liminal Distillery first, then go place it.
Final Steps
Boss Fight
After all 3 Rituals have been completed, place the Sentinel Artifact in front of S.A.M. in the Mainframe Chamber to start the boss fight.
Defeat the boss to complete the Main Quest.