Main Quest
Stats (Solo): Difficulty - 7/10, Est. Completion Time - 1 Hr to 1:30 Hrs
Obtaining Dr. Thurston's Brain
- Obtain the LGM-1 wonder weapon, and get to Round 10.
- Sneak up behind O.S.C.A.R. and follow him until he plays a recording. Ignore the first three recordings (numbers 18, 7, and 12). O.S.C.A.R. can't hear you shoot or "feel" you touch him, so as long as you don't damage him or get in his vision, he won't notice you. You can shoot while behind him with no consequences, as long as you don't damage him.
- During the fourth recording (number 20), Dr. Thurston will say the names of three planets in order. Convert those planets into numbers based on their distance from the Sun (Mercury = 1, Venus = 2, Earth = 3, Mars = 4, Jupiter = 5, Saturn = 6, Uranus = 7, Neptune = 8).
- Once you have the three digit number, enter it into the machine in the 'Observatory Dome'. If done correctly, a platform will come down left of the Pack-a-Punch machine that you can jump onto. On this platform, interact with the Key on the floor to pick it up.
- In the 'Museum Infinitum', shoot the glass on the display case, right of the Exfil phone booth, to break it. Once broken, pick up the Rock Saw.
- In 'Machina Astralis', interact with the Cryopod to open it. Hold interact on the body to cut out the brain. O.S.C.A.R. will automatically teleport to this room while you're cutting, but you are immune from all damage while cutting.
- Once you have the Brain, interact with the Brain Jar across from the Juggernog machine in 'The Luminarium' to replace the brain that's already inside.
- Interact with the Jar again to start a defence objective. Defend the jar from Zombies for a minute.
- If you fail to defend the brain, you can retry on the next round.
- Once the defence objective is done, pick up the Brain Jar. You'll be slowed while holding it. Interact with the machine in 'Machina Astralis' to place the brain, then hold interact to connect the Brain to the machine.
Activating the Portal
- Once the Brain is connected, the screen on the left side of the machine will show "Dr. Thurston's Reading List" followed by a list of books (the number of books is different for each game).
- Each book belongs to a group of three. Using this cheat sheet, find the number of books corresponding to each statue.
- Example: Your books were "The Black Veil, Ash and Bone, Echoes of Andromeda, Silence at Singularity, and Witchlight Codex". Based on the titles associated with the statues, your numbers would be: Statue 1 = 1, Statue 2 = 2, Statue 3 = 2.
- Once you have your numbers for each statue, go to the 'Archive of Orbis' and quickly interact with each statue the number of times indicated by the books. If done correctly, the ceiling above the ladder in the same room will open, revealing a model of Neptune for you to pick up.
- If you take too long to interact with the statues or enter the wrong numbers, you can retry on the next round.
- With the Neptune model, interact with the display rod coming from the large model on the ceiling in the 'Machina Astralis' to place Neptune.
- Around the map, there are three pieces of paper each showing a planet (Mars, Saturn, and Neptune), and a compass direction (NE, NW, SE, etc). Note down the combination of planet and direction. Page locations:
- Once you have all three combinations, go back to the Machina Astralis, and shoot the planets on the model to align each of them in the direction from the paper. There is a compass around the sun, on the underside of the model. The directions don't have to line up exactly with the compass (often they can't), so just get them as close as you can.
- Once the planets are in place, go to the 'Observatory Dome' and interact with the left side of the Organ to use the Telescope. Move the cursor over Mars and note down the DEC number on the bottom left. Combine both numbers into a 4-digit number.
- If one of the numbers is a single digit, add a 0 to the front. Example: 28° 1' becomes 2801.
- Go back to 'Machina Astralis' and enter the code into the machine on the middle level (behind the Armour wallbuy).
- Interact with the machine with the brain to reboot the portal. This locks down the room and spawns O.S.C.A.R. O.S.C.A.R. will repeatedly shoot drones (indicated by a beeping noise) at the portal while it's charging. Destroy the drones before they reach the portal, or you'll lose reboot progress. If the portal takes too much damage by the end of the timer, the step will fail.
- If the portal was defended, you will be teleported to Mars automatically.
Obtaining the Ascendant Eye
- Once you're on Mars, Thurston's Brain Jar will fall to the floor on the platform in the centre of the area (takes a few seconds to spawn). Pick it up. You'll be slowed again.
- While on Mars, (seemingly) randomly a low-gravity mode will activate. This is indicated by a few horn blasts.
- Interact with the machine where you spawned on Mars to place the jar. Hold interact to connect it to the machine. This will spawn a portal up the stairs from the machine that will take you back to the main map. You can teleport back to Mars from the portal in Machina Astralis.
- Interact with the Brain machine on Mars to play music (it's more of a long, single tone). This can only be done once per round. If you fail to grab the Ascendant Eye (a few steps away), you'll need to restart from here.
- The music will automatically activate after you connect Thurston's Brain Jar, so if you miss this, you'll need to end the round to try again. After that first automatic play, the music will only activate when you interact with the machine.
- On Mars, shoot five pylons around the arena. There are four pylons outside the map (from the perspective of facing the Brain machine) and one above the portal. When shot, the pylon will glow blue.
- If done correctly, the Ascendant Eye will fly around above the arena. Wait until it gets low enough to grab, then jump toward it and hold interact to grab it. If you fail, it'll fly away. End the round, play the music, and shoot the pylons to try again.
Activating the Pillars
- Place the Ascendant Eye in the device on the right side of the arena by the Crafting Table.
- Using the LGM-1, shoot the antennas on top of the five pillars found around the arena. If done correctly, each one will play a sound, and a symbol will be lit up at the base of the pillar. Pillar locations:
- Go back to the main map, and head to the Observatory Dome. Interact with the screen on the right side of the Organ. It will display five things: four symbols and one static. Using this cheat sheet, note the symbols and the order, and substitute the static for the missing number.
- Example: Screen showed 14S52 (S = Static), then your order is 14352 because 3 is not in the list already.
- Back on Mars, interact with the blue symbols on the pillars in the order from the Organ. If done correctly, the screen will flash white.
- If you interact with a pillar out of order, the blue symbol will turn red, and you can retry on the next round. The order of the symbols doesn't change if you fail.
Caltheris Boss Fight
Phase 1:
- Interact with the Brain on Mars to start the boss fight.
- A Giant Skull (Caltheris) will spawn in the sky above the arena. She can only attack you with a laser beam. You can outrun it, but it follows you as you move.
- Kill Zombies anywhere around the arena to charge the coil on the right side of the arena. The coil is made up of three parts; as you fill the coil with kills, the sections will begin glowing.
- Once the coil has been charged, the screen will flash white. Hold interact on the Brain to fire a beam at Caltheris. You're extremely vulnerable while interacting, so make sure it's safe before starting.
- Once the beam is done and Caltheris has been damaged, she gains a new attack. She will fire meteors at you, indicated by an orange circle on the ground. The meteor will leave fire on the ground that lingers for a while, damaging players who walk over it.
- Kill Zombies anywhere around the arena to charge the other coil on the left side of the arena. Once charged, fire the beam the same way as before.
- After the second beam, Caltheris can fill the lowest parts of the arena with gas that reduces the health of any player in it to 175. Toxic Zombies will spawn with the gas.
- Kill Zombies to charge both coils, and interact with the Brain when charged.
Phase 2:
- Upon firing the beam for a third time, the Giant Skull will be destroyed, and Caltheris will spawn in the middle of the arena in the form of a rock creature. After a short animation, she'll start chasing the nearest player, slapping them if she gets too close. She'll also throw rocks.
- Shoot her anywhere to break her armour, revealing a glowing weak point. Once her health bar hits zero, the phase will end, and she will teleport back to the center of the arena.
Phase 3:
- After being immune for 30 seconds, she'll become "Caltheris Ascendant". This phase is identical to phase 2, except she is now more aggressive in chasing and attacking players, and she gains a ground slam attack that can be avoided by jumping.
- Once her health hits zero, she'll teleport back to the center and become immune for another 30 seconds.
Phase 4:
- After being immune, she'll become "Caltheris the Needle". She becomes faster and more aggressive, and the rock she throws will leave electricity on the ground that lingers and damages players.
- If you've completed the Ashes of the Damned easter egg, a power-up called Veytharion's Blessing will spawn in front of the Brain machine. It grants players infinite ammo and equipment for its duration.
- Once her health bar hits zero, she'll teleport to the middle and the ending cutscene will begin.
Tips