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Head back to the Medical Bay and insert the Decontamination Agent into a glass case on the wall. The computer will now tell you that it waits for a subject. As a subject, you will need a Megaton. In case there isn't any, simply wait till a round when it will spawn. Now lead him in the Medical Bay, under the Wechsler decontamination room, and shoot the creature untill it splits into two. You can also harm the Megaton till it almost splits in two, cease fire, lure him under the Wechsler, and shoot the final shots on it. When it splits in two, the creatures will be sucked into the decontamination room. You need to make sure to lure both creatures in the machine.

Now head to the old Tiger II Tank outside. You need to interact with it on four places to fix it with the Dark Aether wrench. After doing so, a zombie will crawl out of the hatch on top of the vehicle: Kill it! Now locate a nearby Crafting Table where you need to craft a Semtex Grenade. Throw this grenade at the little hatch where the zombie just crawled out of. This will cause the Tank to fire a missile at a tree located at the Crash Site. Head over to this tree and you'll be able to pick up a 'Decontamination Agent'.

So all cylinders of der Wechsler have been activated by either one of the wonderweapon upgrades. Now proceed by entering the Dark Aether. Head back to the Medical Bay, to the upstairs floor, and interact with the anomality encountered. After listening to a short conversation, leave the Dark Aether and you will find a 'Dark Aether wrench' in the Medical Bay. Interact to collect it.

Go to the penthouse on top of the Nacht der Untoten building. At the top, look over the edge of the building near the green tarp and you will find a box just towards the left. Shoot it and pick up the flask that is dropped near the water area below. Once you have collected the flask, look for the nearby tree that is covered in fungus. You will need to lure a Megaton to this area and have it blast the fungus covered tree with its radioactive attack. Having done so, interact with the fungus and place the flask beneath it. Once the flask has been filled, pick it up and make your way to the Medical Bay in the underground facility. Upon arriving in the Medical Bay, you will find a a small box covered in chains, not too far from the Particle Accelerator door. Using your flask, interact with the box and have the flask remove the chains. When opening the box, you will be rewarded with the D.I.E. Cryo-Emitter. Once all four cylinders have been risen up, it is time to proceed to the next step

Go to the Dark Aether and head for the crashed plane. Here, you will find a small box beneath the floating plane wreckage. You need to do the following steps as quick as possible, as there is a time limit: Melee the small box will give you a fuse. Holding the fuse, make your way to the Weapons Labs in the underground facility and place it in the Plasma Cutter (found across of the perk machine). Now return to the normal world and go to the water pond. Here, you will find a small box at the old truck and you will find the D.I.E. Thermophasic upgrade when interacting with it.

.To get the Electrobolt, you need to enter the Dark Aether and collect three energy crystals with your regular D.I.E. wonderweapon. These can be found at the following location and at any order. It is important to note, however, that you can grab only one crystal at the time, meaning that you have to make three trips to the Dark Aether in total: At the roof of Nacht der Untoten, above the Stamin-up machine. There can be a Mayak guarding it. As soon as you picked up the crystal, the D.I.E. will colour orange and you shouldn't shoot anymore. In the crashed plane area, near the entrance to the tunnel underground. In the water pond, near the possible Mystery Box location and close to the entrance to the tunnel. When picking up each crystal, return to the large Cyclotron room in the underground facility and shoot the crystal in the radiobox that can be found on the first floor of the room. When you did this with all three crystals, you will receive the Electrobolt upgrade for the D.I.E.

For the Nova-5 upgrade you need to go to the top of the Nacht der Untoten bunker. Upon looking to a small room at the end of the building, you can see a small yellow canister laying on a table. You are unable to reach the room yourself, but fortunately you carry the D.I.E. Wonderweapon with which you can suck the canister towards you. Once you grabbed the canister, head to the Weapons Lab in the underground facility. Put the canister in a white machine standing right of the large blueprint hanging on the wall. A Plaguehound will spawn, kill it near the machine. The canister will now fill itself with the gas from the creature. Pick it up and head towards the crashed plane. Against the bunker, you will here find a small box, interact and melee with it: You can now pick up the Nova-5 upgrade for the D.I.E.

The next step may sound complicated, but it is actually quite easy. Now, return to the Wechsler in the Medical Bay, where the computer says that it needs more power. Now, the D.I.E. can be upgraded in four variants. You need to shoot the Wechsler, the contamination camber suspended in the room, with each wonderweapon upgrade. The next four steps will explain how to get each upgrade. If shot succesful, the four cylinders in the corners of the vessel will rise up, one by one. Each one of the four cylinders respond to a different upgrade, so you will need to try shooting them all. Once all four cylinders have been risen up, it is time to proceed to Step 13.

If you haven't yet, you need to obtain the Decompressive Isotopic Estrangement device (or D.I.E. in short). When a Megaton spawns, kill it and subsequently kill the two halves. One of them will drop a Keycard which you need to pick up. Now head to the Weapons Lab in the underground facility and face the cabinet with the broken glass. Use your keycard on the computer next to it and the cabinet will spawn the D.I.E. Remote Control. Now go to the "Living Room" in the Nacht der Untoten bunker, and notice a crack in the wall with blue electricity behind it. The room behind this crack is inaccesible yet, but you have to interact with the crack which will activate the D.I.E. device behind it, using the remote control. Now start to kill zombies in front of the machine, You need to kill approximately 30 of them, and every 'succesfull' kill will release a blue Lifeforce from the zombie's body, siphoned into the machine. Once you have killed enough zombies, discharge the device and watch as the door to the room is blown off. Inside the room, you will find a skeleton holding the D.I.E. device. You can now pick it up.

After having interacted with all three spirits, leave the Dark Aether and return to the office where you earlier found the Diary. Here, interact with the computer and input the password to activate the Wechsler.

You have to interact with each of the three anomalities. Initially they appear as a blue ball of energy, but interacting with them will change them in a humanoid spirit. Their locations are the following: Medical Bay: On the lowest floor of the Medical Bay, just beneath the office in which you found the diary. Control Room: In the Control Room, towards your right as you enter the room from the underground facility. Particle Accelerator: In the Particle Accelerator room, next to the workbench where you have built the Aetherscope.

Enter the Dark Aether and head to the Medical Bay. Here you will find Doktor Vogel's Diary on the desk next to his computer. Interact with it and three spirit-like 'spectral anomalities' will spawn around the facility (only visible in Dark Aether mode).

The Aetherscope is a device that allows you to see spirits from "the other side", having a prominent role throughout the Easter Egg quest. It can be built on the crafting table under the Cyclotron, and requires three parts. Only one part spawns at a time, and the order is random. So you have to locate a part on one of the three locations before you can find the next part at another location. The three locations are all in the Dark Aether, so you have to travel through the dimensional anomality again. Location 1: In the Cyclotron room, at the staircase leading towards the upgrade station, right next to an Aether Tunnel and a vent. Location 2: In the Spawn Room, outside next to the blocked staircase. Location 3: On top of the engine of the crashed plane. After having built and picked up the Aetherscope, it will work for all teammates. The device detects anomalies in the Dark Aether, like spirits and special objects.

Next, you have to stabilize the particle accelerator by interacting with two computer terminals, left and right of the Cyclotron. Upon doing so, a dimensional anomality will take shape in the middle of the apparatus. Interact with it (keep pressing the button) will make you teleport into the Dark Aethereal mirror version of the map. You will remain in this realm for a limited time (2 minutes or so), so hurry up with doing what you must: Step 1: Localize the Aether Tunnel outside on the surface of the map (it is indicated). Now spend 500 points upon using it, and you will flow to an underground room Step 2: In the underground room, you will find a spirit-like 'Machine part' of the Pack-a-Punch. Interact with it to pick it up. Step 3: Now head to the center of the Cyclotron, the very same place where you have entered the portal for the first time. You will find a rough spirit-like structure of the rest of the Pack-a-Punch. Interact with it to add the part, after which you will be teleported back to the normal world and you will now have build a physical Pack-a-Punch. In case you didn't make it in time and you are teleported back to the normal world before you have succeeded in building the Pack-a-Punch, simply wait till the Anomality reappears again (somewhere else) in the map. This will take about one round. Enter the Dark Aether again and proceed with where you were left.

As a classic first step for a zombies map, Die Maschine also requires you to start with turning on. To do this, simply proceed to the Cyclotron in the underground facility and push the red button.

The final battle against the Shadowman begins! Time to show him what you got. Step 1: Place the Summoning Key in one of the green glowing standards on the upper level walkways. Step 2: Charge the Summoning Key by killing zombies around it (watch out! Panzer Soldaten and Margwas will also spawn!). Do this untill the Key begins to shine a yellow colour. Interact with it and you will be able to pick it up, taking the place of your weapon. Now throw the key on Sophia's spirit, floating in the middle of the room. Upon doing so, it will release a red laser beam which destroys the Shadowman's shield. Step 3: You can now damage the Shadowman by shooting on him. While doing so he will randomly teleport around the altar. Keep shooting on him untill he is in the mounth of the great Apothicon Overlord statue at the back of the arena. Step 4: Now quickly, interact with the Kronorium book, laying on the altar. If you are too late, you have to redo the previous step untill the Shadowman is in the mounth again. If you succeeded, you have finished the Easter Egg! Congratulations, the Cycle will continue!

The Summoning Key takes up one weapon slot of the player who carries the artifact, and can be thrown. It must be thrown at 7 specific locations throughout the map, all being locations of Easter Eggs from the old maps. These locations are the following: Mob of the Dead: Look at the cells from the bridge on the wall opposite the Corruption Engine. Throw the Summoning Key at the poster inside one of the open cells. Verruckt: Looking toward the Corruption Engine, look left to spot a fountain with a machine gun mounted on top. Throw the key at the gun on the fountain. Shangri-La: To the left of the stairs leading up to the top of the temple, look left. There’s a Keeper statue, but further left there is a bright blue orb on a staff. Throw the key at this object. Origins: Go to the top of the hill in Origins (where the entrance down into Mob of the Dead is located) and look for a gravestone at about eye-level on a wooden catwalk. Der Eisendrache: Throw the key at the clocktower face visible just over the ceiling ruins when looking up from the Corruption Engine area, near the portal to Nacht der Untoten. Nacht Der Untoten: Go to the lower-level wall with a view of a crashed truck in the background. To the right of the truck is a red barrel. Hit the red barrel. Kino der Toten: Hit the huge chandelier hanging above the seating area. After throwing the Summoning Key correctly in Kino, the teleporter has to be used again. All step in the teleporter and interact with it at the same time, which will teleport you to the arena again to complete the Boss Fight. It is recommended to read the next step beforehand, so you know what to do before entering the arena.