Entering the vault in Doom's Domain is one of the challenges you can complete in Fortnite Season 4.
Similar to the Catty Corner vault challenge in Season 3, this challenge sees you defeating a boss NPC, in this case Doctor Doom, to collect the Doctor Doom's Keycard, which you can then use to enter, and loot, the Doom's Domain vault.
Completing this challenge will reward you with XP that will help you climb the Season 4 Battle Pass ranks and possibly supply you with the loot you need to win a match.
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Doom's Domain vault location in Fortnite at a glance
The vault in Doom's Domain is located in D3 of the Fortnite map, which is the southern part of Doom's Domain.
The hidden area beneath the football field in Doom's Domain is once again accessible and the vault, guarded by two of Doom's Henchmen, can be found at the bottom of this location.
Be careful when you jump down into this area, as a fall too long will take a portion of your health. You'll also want to ensure that you don't attract the attention of Doctor Doom (if he's there) or either of the henchmen, before you're ready.
To leave this area, you can either use the choppa or, if it's absent, the portable toilet near the vault, which will transport you to the basement in Doom Manor.
Recent new quests include Touch a Cube, Spirit Vessel Caretaker's footprints, Command Signal, scroll locations, mini-pufts, seismographs, Ghostbusters signs and deploying a ghost trap for the Containment Specialist. Elsewhere in Season 8, you can start using Sideways weapons, partake in Sideways encounters, and find colour bottles for Tonna Fish.
How to get Doctor Doom's Keycard in Fortnite
If you want to access the vault in Doom's Domain, you need to collect the Doctor Doom's Keycard by defeating him in Fortnite.
Luckily, Doctor Doom will spawn in one of two locations within Doom's Domain every match. These locations are - the area directly outside the vault or any of the floors within Doom's Mansion.
The area outside the vault is obviously the easiest location to find Doctor Doom, because he's confined to a smaller area. The downside with this location, however, is that there's also two Doom henchmen you'll have to defeat. Due to this, we highly recommend taking out these henchmen first, because you'll make the area safer for yourself and be able to use their powerful weapons.
It's a good idea to check the area outside the vault for Doom first, because, if he's not there, you can use the portable toilet near the vault to teleport to the basement of Doom's Manor.
We also recommend disguising yourself as one of Doom's Henchmen while searching for him, because it will prevent NPCs from attacking you.
Doctor Doom's main attack involves sending balls of green energy towards you, which you can dodge by taking cover and quickly moving out of the way. It's a good idea to keep a certain amount of distance between you and Doom, so that you can see these attacks coming.
If you feel like you're being backed into a corner when battling Doctor Doom, don't be afraid to go on the defensive and look for better ground. He can easily defeat you if you're either too close to him or if you have nowhere to run.
Doctor Doom does have a shield, which you'll have to break before you can cause any deal damage, so we recommend using a shotgun at the beginning of the fight, before moving onto a faster firing weapon to finish him off with.
After you've defeated Doctor Doom, make sure you collect his keycard and then, safely, head to the vault.
Once you're there, kill the Doom's henchmen if you haven't done so already and then swipe the keycard through the terminal next to the vault to gain access.
You can now loot the vault and hopefully collect the items that will allow you to win the match.
If you'd like to learn more about Season 4 of Fortnite, you can check out our guides on the Season 4 Battle Pass Skins, the Wolverine challenges, including how to defeat Wolverine, and the location of Tony's Stark's secret lab.