1.Open the door to Quantum Computing (1,750 Essence).
2.Enter the T1 Quantum Computing Core and keep moving forward.
3.Unlock the next door (2,000 Essence) to access the T1 Quantum Computing Lab.
4.Use the Anti-Grav Personnel Launcher to reach the next tower.
5.You’ll now arrive in T2 Android Assembly. Head toward the Entity Containment door and open it (2,250 Essence), then take the nearby Aether Elevator.

1.1 This elevator sends you to the T2 Dark Entity Containment area.
1.2 Use the next Anti-Grav Launcher to return to T1, landing at the T1 Executive Suite.
1.3 Unlock Richtofen’s Office (2,500 Essence) and interact with the snow globe on his desk.
This opens the red teleporter, granting access to Sublevel 10.

Enter the red teleporter to reach T2 Sublevel 10. Go up the stairs to the Particle Accelerator Control Room and interact with the console to power the system. After activation, 12 Aetherium Crystals will appear on coolant pipes.

Shoot all 12 crystals.

LEGS LOCATION






KLAUS ARM LOCATION
Shoot the left arm of a Kommando Klaus to drop it.
Shoot the right arm of a Kommando Klaus to drop it.

Attaching arms and legs to the robot



Wait until a Mecha Klaus spawns in a later round. Lead it back to the Android Assembly room, near the hanging body.

Bait Mecha Klaus into using its electric ranged attack. Franken Klaus will come to life and begin moving toward a nearby computer terminal to initiate his first hack.

Interact with a terminal in T2 Android Assembly.
Move to a SAM Trial terminal — this is a simple challenge that requires getting a set number of kills within a marked area.
Proceed to the T2 Teleportation Lab, where he begins a final system access.

Collect Four Maxis Items
Inside T1 Executive Suite and T1 Director’s Office, locate four Maxis-related items, each tied to a folder with a unique archived date and a number.

Katana (desk)
Wristwatch (table)
Combat Goggles (near lamp)
BND Badge (coffee table or desk)
Notso’s Collar (office desk)
Scarf (bookshelf or chair)

You only need four per match. Each item has a visible number (e.g., 6) and an archive date (e.g., 10/07/2022). Use the first digit of the date to determine order, then string together the item numbers.

Go to the T2 Teleportation Lab terminal.
Enter the digits in chronological order based on the first number in each item's archive date.
Example: if your items are 4 (date: 9/12), 6 (date: 10/11), 2 (date: 12/02), 5 (date: 8/23), then the final code is 5246.

Head to the T1 Quantum Computing Core and locate a metal container near the SAM terminal.
Melee the container to break it open. This may require the Melee Macchiato perk — while some players have opened it without the perk, grabbing it guarantees success.
Inside, you’ll find a glowing purple brain.
Pick it up and prepare to move fast — carrying the brain disables your weapons.
Deliver the Brain to Klaus
Return to the T2 Teleportation Lab where Franken Klaus is active.

Interact with the terminal next to Klaus to insert the brain.
This powers up the SAM system, allowing you to progress toward the Wonder Weapon and mutation experiments.

Decode the Chemical Element
Begin in the Mutant Research Lab and Mutant Research Test Area, where two static-filled monitors display random words each round.

Visit both monitors and note the first capital letter of each word.
Combine these two letters to form a chemical element symbol (e.g., "C" and "U" = Copper).
Cross-reference the symbol with the periodic table on the wall in the Test Area.
Grab the atomic number from the top-left of the element’s box and add a zero in front to make it a 3-digit code (e.g., Copper = 29 → 029).
Now, go upstairs in the same room and enter the code into the keypad. This unlocks the Bioweapons Lab, where the mutation begins.

Charge the Cyst with Zombie Essence
Inside the Bioweapons Lab, you’ll see green goo contained in a tank.

Train a group of zombies and weaken them with a low-damage weapon.
Lure them near the tank. The machine will absorb roughly 10 zombies.
Once done, interact with the tank to collect the filled cyst.
Now, onto the next cyst-related step.

Energize the Cyst with Spores
Take the filled cyst to the Quantum Labs (back in T1) and find the yellow-glowing mushrooms on the walls.

Stand near a glowing mushroom to absorb energy into the cyst.
Repeat this with three mushrooms total.
Once fully energized, the cyst will be ready for transfer.

Transfer the Mutant Energy and Summon the Forsaken
Move to the Dark Entity Containment Room and activate four surge panels by interacting with them.

This powers up a pressure plate and spawns Uber Klaus.
Weaken Uber Klaus by destroying his shoulder pads, but do not kill him.
Lure him onto the electrified pressure plate with low health.
A white screen flash will occur, transforming him into the Forsaken.
Defeat both forms of the Forsaken. Once he’s down, you’ll be able to place the cyst into the glowing orb at the center of the room. This will forge the Black Ops 6 Gorgofex Wonder Weapon, now essential for future steps.

Cleanse the Zombie Head and Capture Aether Shards
With the Gorgofex Wonder Weapon in hand, you’ll now trigger several new mechanics. This phase includes collecting a severed zombie head, cleansing it, and using special devices to capture floating Aether shards around the map.

Retrieve the Zombie Head
Return to the T1 Quantum Computing Core.

Use the Gorgofex’s charged shot to fire into a gap in the ceiling above the main area.
This will knock loose a severed zombie head, which drops to the floor. Pick it up.
Cleanse the Head in the Mop Bucket
If you followed the early setup step at spawn, you should have already melee’d a mop bucket into position beneath a sprinkler.

Go back to the spawn area.
If the bucket is full of water, place the zombie head inside it.
Wait a moment, then pick the cleansed head back up.
The head now becomes a soul box.

Charge the Soul Box
Stay near the head and kill zombies in its radius. After enough kills, the head will become fully charged.

Then, bring it to the T2 Teleportation Lab and place it next to the teleporter. This sets up the final stage of prep before entering the lockdown phase.

Find the Gers Devices and Capture Aether Shards
Now, explore Tower 1, particularly the floors near the Executive Suite, and look for any of five boxes that contain secret Gers Devices.

Pick up a Gers Device.
Look for floating purple Aether shards hovering throughout the tower.
Throw the Gers at them to “capture” the shards — it works like a Poké Ball.
Do this for four shards total, retrieving the Gers each time.
Once all four shards are captured, return to the Teleportation Lab and insert the devices into the machine near the teleporter.

Begin the Lockdown Sequence
With the Aether shards delivered, interact with the machine beside the teleporter in the T2 Teleportation Lab to trigger the lockdown.

Once activated, the room will seal, and five switches will begin turning red.
Monitor each switch closely. As each one lights up red, interact to flip it to green.
Continue flipping all five switches until they stay green. This ends the lockdown sequence.
After a short moment, the teleporter becomes active again, now functioning as the gateway to the final battle.

Pick Your Final Boss
Before stepping through the teleporter, the game will prompt you to choose between two paths:

Choose Samantha: This leads to a more straightforward fight.
Choose Richtofen: This is considered the harder fight with tougher mechanics.
The character you don’t pick will be the one you fight in the final phase. For example, picking Samantha means you’ll face Richtofen, and vice versa.

If you want a more manageable experience—especially solo—pick Samantha. If you're looking for a challenge, go with Richtofen.

Once you’ve made your choice, interact with the teleporter and step into the final boss arena.

Boss Fight – How to Beat Samantha or Richtofen
The BO6 Zombies Reckoning boss fight features one of two possible enemies based on your earlier choice: either Samantha Maxis or Edward Richtofen. Each fight takes place across multiple phases and layers of vertical movement, with unique mechanics tied to each boss. You’ll first complete a setup phase before entering the true boss arena.

Elevator Phase – Ether Canisters and Crystals
As soon as the fight begins, you’ll spawn on a multi-floor elevator platform.

Activate the Ether Canisters
Interact with each of the three canisters on the platform.
Get kills nearby to charge them, similar to soul boxes.
Once fully charged, the elevator will begin to rise.
Shoot the Glowing Crystals
On the next floor, floating red Aether crystals will spawn.
Destroy all visible crystals. Use charged Wonder Weapon shots or ARs with Dead Wire to speed this up.
When all crystals are destroyed, the elevator ascends again—this time to the final arena where your selected boss awaits.

Boss Choice Mechanics
Once you reach the top, the boss fight plays out based on who you chose earlier:

Fighting Samantha

Samantha appears as a massive floating orb surrounded by Aether energy.

Damage Window: She becomes vulnerable when:
Firing a major AOE attack
Opening her red orb clusters
Focus all DPS during these brief windows.
Use ranged weapons, like a Pack-a-Punched assault rifle or LMG, to hit her even while airborne.
Avoid her telegraphed shockwaves and orbs that track players.
Samantha’s fight is considered the easier of the two. Players can survive her phases with careful positioning and burst damage during windows.

Fighting Richtofen

Richtofen appears in human form but uses powerful relic-based attacks.
He teleports constantly, making him hard to track.
Can summon projectiles and energy zones that slow movement.
Will periodically summon waves of elite zombies to pressure the team.
DPS windows occur when he pauses to charge or emote.
This fight is more mechanically intense and punishes poor movement or low DPS uptime. Bring Casimir Grenades and Ether Shroud to reposition or interrupt combos.

Tips for Surviving the Final Fight

Triple Pack-a-Punch your primary before entering.
Use Idol Eyes to distract zombies and clear breathing room.
Equip Dead Wire or Lightning ammo mods for faster boss and add clear.
Prioritize staying alive during invulnerable boss phases—DPS only during openings.