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Gain access to a Halo-inspired weapon in Destiny 2 with this handy walkthrough
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Destiny 2 players are likely aware by now that they can acquire the Forerunner Exotic sidearm - inspired by the Magnum from the Halo franchise - by using the Strange Key from the Magnum Opus side quest. The quest isn't particularly difficult, but figuring out where to get the key and where to use it can be a bit confusing. Fortunately, this wikiHow guide covers everything you need to know about the Strange Key in Destiny 2.

Things You Should Know

  • Visit Xur in Eternity and gather seven Strange Coins to begin acquiring the Strange Key.
  • The easiest way to gather Strange Coins is to complete runs on Dares of Eternity.
  • The Strange Key can be used on a rock down in the Dares of Eternity arena in the Valley, which will grant you an objective marker that can be followed towards the Forerunner sidearm.
Part 1
Part 1 of 3:

Acquiring the Key

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  1. To acquire the Strange Key, you must first acquire the Magnum Opus side quest. And to acquire the side quest, you must first to talk to Xur in Eternity. Eternity was made available as part of Destiny 2's 30th Anniversary Pack. Look for the small planet icon just below the moon on your Director. It should be labeled Eternity . Click to travel to it.
    • With enough currency and reputation, you can outright purchase the Strange Key. Do NOT do this however, as players report a bug in which acquiring the Strange Key prematurely prevents you from using it later on in the quest. [1]
    • To find Xur, select the Xur's Treasure Horde option within Eternity. Once you arrive, you will find Xur behind the door to the left.
      • Speak with Xur to progress the quest, and then speak with him again to pick up the Magnum Opus quest.
    • While you are here, be sure to loot the treasure chest next to Xur, which includes a new weapon.
  2. When Xur gives you your new quest, he will instruct you to gather seven Strange Coins. You can complete most Strikes, bounties, and public events to collect these coins. However, we recommend running Dares of Eternity , as this will also help you build reputation with Xur, which you will need for a later portion of the quest.
    • You will need to run several Dares until you have collected the requisite seven Strange Coins.
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  3. With your Strange Coins in tow, head back to Xur in Eternity. This time, you will find a character named Starhorse (who looks like a horse made of stars) waiting by Xur's treasure chest. Starhorse is selling bounties, and you must complete three of them to continue with the Magnum Opus quest. Purchase three of Starhorse's cheaper bounties (we recommend purchasing daily bounties) and complete them solo or with a fireteam.
    • You’ll need to complete Starhorse's bounties in a single Dares of Eternity run or it will reset back to zero.
      • Prioritize your objective over your point total, as you are likely to reach your required point threshold naturally.
  4. Once you have completed Starhorse's three bounties, you can return to Xur and acquire the Strange Key from his inventory. Find the item labeled Strange Key and click to acquire it.
    • You need a reputation level of Strange Favor or higher to retrieve the key from Xur's inventory. If you ran Dares of Eternity enough earlier, you should definitely have reached this reputation. If not, continue to run Dares of Eternity until your reputation is high enough.
    • With the Strange Key now in your inventory, do not leave the location. Your next steps are nearby.
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Part 2
Part 2 of 3:

Using the Key

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  1. Walk out of Xur's room, but do not leave the location altogether. Instead, walk into the connecting room and stand directly over the purple smoke. You will soon teleport down to the Dares of Eternity arena in the Valley .
  2. You will land on a small ramp. Turn right and walk along the sand until you see some rubble. The rock on the far-right side of the rubble will have a small slab sticking out of it.
  3. Walk around to the other side of the rock until your HUD offers you an interact button, telling you to use the Strange Key. Finding the appropriate spot on the rock can be a bit difficult, so just walk around it slowly until you see the button onscreen.
  4. Once you interact with the rock by inserting the Strange Key, you will receive an objective marker. Follow it towards the grey tower in the distance, where you can acquire an object that can be exchanged for the Forerunner.
    • Although the objective is not too far, you may consider summoning a vehicle for your travels through the Valley.
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Part 3
Part 3 of 3:

Acquiring the Forerunner

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  1. As you approach the tower, you should see a small tunnel formed by the rocks around its perimeter. Continue along the path until you see a group of bronze balls floating up towards the ceiling.
    • You may hop on to one of these balls and ride it upwards if you would like. Otherwise, you can continue to hop on different rock ledges as you work your way up.
  2. Continue to hop from rock to rock until you see a white mountain above you. A series of similarly colored platforms will periodically jut out from the mountainside. Time your jumps onto these platforms correctly to continue your ascension.
  3. Once you reach the top of the chamber, you will have one last room to enter. Walk inside to find a Cryo Pod , which you may investigate. Opening the Cryo Pod will grant you the Anomalous Object , which can be traded for the Forerunner.
    • The Cryo Pod is also a clever Easter Egg for Halo fans.
  4. You are finally free to leave Eternity. Travel to the Tower, where you will need to talk with Banshee-44.
  5. He will offer you a rather lengthy explanation of the object before giving you the Forerunner in return!
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