GW2 The Nightmare’s End Scarlet’s Puzzle guide

A quick guide to Scarlet’s Puzzle in The Nightmare’s End story instance involving Nightmare Euthanizer and Nightmare Terminator achievements.

General Information

Retrying the instance

You can redo this instance by talking to Majory’s Helper Dee in Kessex Hills after you have finished the instance.


Getting to the puzzle

Click on the disabled injector to take the remaining antitoxin and apply it to the Vine Passage.



Completing this story instance for the first time will grant you the Antitoxin Injector backpiece.


Nightmare Euthanizer

  • You must solve all of Scarlet’s Puzzle correctly to get this achievement.

Molten Coolant Box

  • Pick Examine Controls for shutting down power.
  • Pick set slider to flame
  • Pick set slider to icicle
  • Pick set slider to iron.
  • Click on Throw the switch to receive Molten Iron Scrap

Inquest Terminal

  • Pick try to interpret the analytic code
  • Pick collate into quantitiative results.
  • Pick sort by effectiveness
  • Click on Apply this Data Sorting to receive Aetherblade Data

Watchknight Puzzle

  • Revive Watchknight, Look at the different options for various phrases on the Asuran Recorder.
  • Talk to Watchknight and pick Nobody breaks my toys but me! to get Watchwork Core

Toxic Spore Pod

  • Pick Dry Root and Sturdy stick off the ground.
  • Interact with the Lab Table to make into a makeshift torch. After that interact with the little flame thingie to make it into a torch.
  • Interact with the Toxic Spore Pod and pick Hold torch up to the pod. You will get Dried Toxic Spore.


Put all of the 4 items into Scarlet’s Forge. Defeat waves of Toxic alliance mobs and when you inject the antitoxin you will get the achievement.


Nightmare Terminator

  • You must brute force each option and spawn mobs to get this achievement.

Molten Coolant Box

  • Force an overload and defeat the mobs that spawn. Don’t forget to collect the Molten Iron Scrap off the mobs.


Inquest Terminal

  • Turn off power to the console and defeat the mobs that spawn. Don’t forget to collect Aetherblade Data off the mobs.


Watchknight Puzzle

  • Revive the watchknight, go through all the options on the Asuran Recorder.
  • Talk to the Watchknight and pick These watchknights you’re so proud of? Mine now.


Toxic Spore Pod

  • Try to smash the pod open and defeat the mobs that spawn.


After you have done all the above, put all of the 4 items into Scarlet’s Forge. Defeat waves of Toxic alliance mobs and when you inject the antitoxin you will get the achievement.


  • Reanne

    How is this a puzzle? Did you solve it, or just brute force the answers thru trial and error? How would one derive the correct answer?

    • Oruam

      the molten box , by the name of the patch, it was flame & frost (snowflake or icicle), the iron part can be iterated or (chars = iron (legion)) and stuff, the inquest by chosing the logical way to sort the results of an experiment, the toxic spore was easy, the only one hard to catch for me was the watchknight robot.

      • Arthos

        That’s an interesting way too look at it too! I was thinking:
        you melt things with flames, you cool things with ice, boxes are made of iron 🙂

    • Latrotoxin

      Agreeing with all of the above (Oruam) – the watchknight robot wasn’t that hard though if you took part in the Queen’s Jubily Patch and didn’t jump the cutscenes.

    • Maranatha

      Molten (flame) coolant (icicle) box (iron)

  • PJ

    Does each instance completion grant a tricolor key?

    • Shiro

      nope,just tried a second time,got 5 spores and a choice of champ loot bag

  • djc1302

    Is the initial reward for the story account wide or can I get it again using alts?

    • Bob

      The first prize, the backpack skin, can be earned with any toon. You only get one. Spores and Champion backs can be earned indefinitely. (At the time of writing this, Arenanet might change that in the future.)

  • So you can’t get a new tricolour key each day?

    • Bob

      The chest is now on Kessex Hills. You can trade spores in for key parts once a day with Mallory’s friend, indicated with the yellow marker.

  • lbgrob

    When do you get the back piece… after doing all achievments or blowing up the tower the first time? I did that and did not get a back piece… just wondering.

    • You get it when you complete the instance the first time. You get a pop up box with the backpack

      • lbgrob

        OK thanks… I dont think I rec’d it..

        • lbgrob

          nevermind…was there

  • Diego

    What should i do to use the Injector Skin as pve?

    • Just click it and apply the skin to another backpiece in pve.

      • Diego

        Thanks…. So i need another backpack to use this, its just a skin… okay damnit my mind xD….. Thanks very much

  • Souldbound

    its not worth it looks bad

  • Adel

    can’t die in instance to get achivement?

    • Hmm I think you can die? Not sure, I never got downed or died so not sure hah.

      • narg

        I got downed (not died) 3x times in final fight and got achiev witout problem

      • Hachi-chan

        I died once, right after beating all the Aether blade guys and Marjory revived me

  • Jenny

    Ok so I have done both ways prolly 10 x exactly the way you have said here and I am not receiving the achievement.. what else could I try??? thanks

    • Are you finishing the instance? You need to finish the instance to get the achievement.

      • Jenny

        Yes i finish every time

        • Jenny Says

          That’s what she said.

      • Tinkdnuos

        Although hang on…when you say “finish the instance”, does that mean I should NOT take the portal at the end, after injection? Because I’ve definitely taken the portal each time.

        • You get the achievement immediately before you take the portal, when you inject the stuff into the tree.

    • Bob

      There was a glitch with the achievements. It should work now.

    • Tinkdnuos

      I’ve tried 4 times in the past 2 days to get Nightmare Euthanizer, with no success. I’ve solved the puzzles perfectly each time. Two runs each on 2 different characters, all the way through the instance, nothing.

      I’m about to try brute force to see if at least that achievement is working.

  • Hachi-chan

    Works just fine for me. Thank you Dulfy!

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