With the much-anticipated release of Season 1 of MW3, players can get their hands on a mysterious Locked Diary item after completing the new Act 4 mission in Zombies.

Players have been scratching their heads trying to figure out what to do with it, as the game leaves it up to you to figure it all out.

Fortunately, the solution is simpler than it appears, if you know the right steps. Below we go into how you can your hands on the Locked Diary and what to do with it in MW3 Zombies.

What Is the Locked Diary?

The Locked Diary is one of four new items made available in Act 4 of MW3 Zombies needed to open the Dark Aether Rift.

Here’s its in-game description:

“A sealed, leather-bound diary. Icy mist covers the book.”

Locked Diary item description in MW3 Zombies
Credit: MrDalekJD

It is a Sigil item that can be used to open the Dark Aether Rift by placing it on one of the four Rift Pedestals.

To access the Locked Diary, you must complete the Act 4 mission, Bad Signal, and defeat the boss at the end.

How to Use

To use the Locked Diary Sigil item in MW3 Zombies, you must head to the Dark Aether Rift area on the map and place it on the Rift Pedestal with the Cryo symbol.

You will find the Rift Pedestal near the Dark Aether Rift location on a small island the middle of the Urzikstan map during a MW3 Zombies match. Here is Dark Aether Rift area on the map:

Dark Aether Location on Map in MW3 Zombies

On the island, you will see four empty Rift Pedestals. The Locked Diary can be placed on the Rift Pedestal with the Cryo symbol.

Locked Diary on Cryo Rift Pedestal to unlock Dark Aether Rift in MW3 Zombies
Credit: MrDalekJD

It’s very important to note that the Locked Diary is only one out of four Sigil items required to open the Dark Aether Portal in MW3 Zombies. If you haven’t acquired the other three items, you should not place the Locked Diary on the Rift Pedestal yet as it won’t be able to acquire it again.

You will have to go through the process of defeating the Act 4 boss again to acquire another Locked Diary.

Therefore, we recommend keeping the Locked Diary in your stash until you have acquired all four Sigil items to open the Dark Aether Rift portal!

How to Get

To get the Locked Diary in MW3 Zombies you must loot it from a Reward Rift after defeating the Gorm’gant Orcus boss at the end of the “Bad Signal” Act 4 mission.

Thankfully, you don’t have to complete the any of the previous acts in MW3 Zombies to access Act 4. Act 4 was made available to all players at the start of Season 1.

To initiate the Bad Signal Act 4 mission, head over to the missions screen in the menu and select “Contact” when choosing an Act. Then, activate and equip the Bad Signal mission.

MW3 Zombies Mission Select screen choosing Act 4 Contact

Here are its missions and rewards:

  • Missions:
    • Investigate the Anomaly
    • Leave the Dark Aether
  • Rewards:
    • So Many Teeth Charm
    • +10000 XP
Equipping Bad Signal Act 4 Mission in MW3 Zombies Story Missions Menu

How to Find and Defeat the Gorm’gant Orcus Boss

Follow these steps to find and defeat the Gorm’gant Orcus boss:

  1. Leave the map through a Bad Signal Exfil point
    • When opening the map, you may notice Exfil points with stars. Only one will take you where you need to go
    • You’ll know you have the right one if you hover your cursor over an Exfil point and it says “Bad Signal”
    • When you arrive, you should see a pyramid portal that also indicates you’ve got the correct Bad Signal Exfil
Collage of Bad Signal Exfil point on the map and Pyramid Porta for Exfil l in MW3 Zombies
  1. Head into the portal and initiate the Break the Seals quest
    • Once in the Bad Signal zone, you must break four seals located at different locations on the map
    • They are indicated by this icon on your map and in-game:
Seal icon for Bad Signal mission in Act 4 of MW3 Zombies
Credit: MrDalekJD
  1. Break the four Seals indicated on the map
    • You must activate each Seal and defeat a certain amount of zombies within a small radius around it
    • After breaking all four seals, you’ll be given your next objective: “Leave the Dark Aether”
Collage of activating seal and defeating zombies for Bad Signal mission in Act 4 of MW3 Zombies
Credit: MrDalekJD
  1. Defeat the Gorm’gant Orcus boss
    • Head to the location indicated on your map. Doing so will spawn the Gorm’gant Orcus boss!
      • You’ll need to take it out. It’s a very difficult fight, so make sure you’re prepared! Check out our tips and tricks below for more info
    • Defeating the boss will reward you with the Locked Diary Sigil item!
Gorm’gant Orcus boss for Bad Signal mission in Act 4 of MW3 Zombies

Once you have the Locked Diary, you can Exfil with it and keep it in your stash! This is important, as you’ll want to hold onto it while looking for the other three Sigil items to open the Dark Aether Rift.

Gorm’gant Orcus boss – Tips & Tricks

This is intended as endgame content for MW3 Zombies and its difficulty will certainly reflect that! Because of this, you’ll want to make sure you’re as prepared as possible before taking on the Gorm’gant Orcus boss.

Here are a few tips:

  • Party up
    • Though you can attempt this fight solo, we don’t recommend it. Gorm’gant Orcus is intended to be an incredibly tough fight so you’ll need all the help you can get from other players!
  • Spend as much time as you can in the initial map area
    • Make sure to spend time acquiring and upgrading gear before you head to the Bad Signal Exfil point. This is because the 45-minute timer will reset once you enter the new zone
    • This gives you plenty of time prepare for the upcoming fight!
  • Fully Pack-A-Punch your weapons
    • Having a Level 3 Pack-A-Punched will help considerably as you take on Elite enemies and deal more damage to the boss
    • To help streamline this process, bring along and use some Aether Crystals from your stash
  • Stock up on Self-Revive Kits
    • This is essential for (very brave) solo players, but we’d even recommend it for those in a squad
    • You’ll likely go down often, so having a chance to self-revive will go a long way in keeping you in the fight for longer!
MW3 Zombies Season 1 Key Art showing a squad using a Bad Signal Exfil Portal

Check out how to get and use all Sigil items to unlock the Dark Aether Rift in MW3 Zombies here for more detail on everything else you need!

Staff Writer
Passionate gamer and writer, Alpay has been featured on GamingIntel, Stuff.tv, and TheGamer. When not writing, he delves into virtual worlds, enjoys high-concept TV shows, and splurges on Steam sales.
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