I don't own the Season Pass, to preface this. I'm stuck at a quest step where it's asking me to purchase an upgrade, yet it seems that none of the upgrades on the screen are purchasable, and certainly not for those with a season pass.
destiny-2 – Stuck at ‘Bunker Upgrade’ Part of Raising Our Defense Quest for Season of the Worthy in Destiny 2
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Related Solutions
A new guide (about 3 days old as I write this) suggests that the most efficient way to grind out bright dust is to run specific Crucible, Gambit, and Strike bounties. Old methods involving Bright Engrams are no longer viable since the Shadowkeep launch.
You can expect to earn around 200 per hour with the most efficient running possible.
A full data-mined list of the relevant bounties follows, copied from the guide:
Crucible
24-Hour Bounties
Hunter Slayer: Defeat 5 Hunter opponents. Super Slayer: Defeat 5 enemies with super final blows. Titan Slayer: Defeat 5 Titan opponents. Warlock Slayer: Defeat 5 Warlock opponents. Arc Slayer: Defeat 10 enemies with Arc final blows. Auto Rifle: Slayer Defeat 10 enemies with Auto Rifle final blows. Grenade Slayer: Defeat 10 enemies with grenade ability final blows. Melee Slayer: Defeat 10 enemies with melee final blows. SMG Slayer: Defeat 10 enemies with Submachine Gun final blows. Void Slayer: Defeat 10 enemies with Void final blows.Weekly Bounties
Combat Drill: Earn 100 points by completing Crucible matches. Defeating opponents and assisting or being assisted by your teammates grant the most efficient progress. Quantum Mechanic: Earn 100 points by completing Crucible matches and defeat opponents with Void damage. Defeating opponents with Void Supers and Void Power weapons grants the most efficient progress. Ride the Lightning: Earn 100 points by completing Crucible matches and defeat opponents with Arc damage. Defeating opponents with Arc Supers and Arc Power weapons grants the most efficient progress. Step Into the Light: Earn 100 points by completing Crucible matches. Casting your Super, defeating opponents with your Super, and shutting down opponents in their Super grant the most efficient progress. Thrill of Victory: Earn 100 points by completing Crucible matches. Wins grant the most efficient progress.Gambit
24-Hour Bounties
Blocker Gamble: Send 5 Blockers to your opponents. Guardian Gamble: Defeat 5 opposing guardians. Super Gamble: Defeat 15 enemies with Super final blows. Arc Gamble: Defeat 25 enemies with Arc damage final blows. Auto Rifle Gamble: Defeat 25 enemies with Auto Rifle final blows. Grenade Gamble: Defeat 25 enemies with Auto Rifle final blows. Melee Gamble: Defeat 25 enemies with melee final blows. Mote Gamble: Collect and bank 25 Motes. SMG Gamble: Defeat 25 enemies with Submachine Gun final blows. Void Gamble: Defeat 25 enemies with Void damage final blows.Weekly Bounties
Do It: Earn 5 points. Wins add 3, losses add 2. Might of the Traveler: Earn 100 points by casting Supers, defeating enemies with Supers, and creating Orbs of Light. On the Grind: Earn 250 points by defeating enemies, defeating Guardians, and banking Motes.Strikes
24-Hour Bounties
Finishing Striker: In strikes, defeat 5 enemies with finisher final blows. Arc Striker: In strikes, defeat 25 enemies with Arc damage. Auto Rifle Striker: In strikes, defeat 25 enemies with Auto Rifle final blows. Grenade Striker: In strikes, defeat 25 enemies with grenade ability final blows. Hive Striker: In strikes, defeat 25 Hive enemies. Melee Strike In strikes, defeat 25 enemies with melee final blows. SMG Striker: In strikes, defeat 25 enemies with Submachine Gun final blows. Vex Striker: In strikes, defeat 25 Vex enemies. Void Striker: In strikes, defeat 25 enemies with Void damage.Weekly Bounties
Break The Machine: Complete 3 strikes and defeat at least 1 Vex strike boss. End The Ritual: Complete 3 strikes and defeat at least 1 Hive strike boss. Force Projection: In at least 3 strikes, defeat 150 enemies with Void final blows. Lightning Strikes: In at least 3 strikes, defeat 150 enemies with Arc final blows. Thin the Horde: In at least 3 strikes, defeat 150 Hive enemies. Wrench in the Works: In at least 3 strikes, defeat 150 Vex enemies.
According to @Sadak in the comments, as well as this reddit thread, this bug as been resolved in Update v2.7.1.
On January 9th, 2020, Bungie released their weekly news article after the holiday season had come to pass. This news article contained an official statement that they are currently tracking this issue, as well as various other issues that have risen
TRACKING KNOWN ISSUES
Over the past few weeks, a few more issues have surfaced that our Player Support team has been tracking. Below is a list of the latest known issues that were reported in our #Help Forum:
- The Leviathan's Breath Exotic Bow currently cannot be acquired due to an issue with 'The Arms Dealer' strike where it can only be completed in Season 8.
The article did not state if a fix will be applied for this quest in this update, but at least we have something official from Bungie regarding this bug.
There is currently a bug around this quest within Season of the Dawn. There are multiple reports where players are unable to finish this quest once Season of the Undying ended.
Bungie released a help guide on what is being removed in the new season. The guide states
Once Season of Dawn begins, the following list of items will no longer be available to players from Season of the Undying:
- The Leviathan's Breath exotic quest if players didn't own the Season Pass. This will be available to players who own a Season Pass either now or in the future.
So based on this information, you should be able to complete this quest in Season of the Dawn as long as you have the season pass. The reports I linked state that Bungie is aware of this issue, and should hopefully implement a fix for this
Best Answer
So it seems the information is hidden away and poorly designed -- it turns out there's a very specific component that needs to be purchased for this step.
Right click on the EDZ Bunker Upgrades icon
Purchase the "Valkyrie Spawner: Tier 1" upgrade here.
This is the only upgrade in the list that doesn't require the Season Pass, and every other item shown requires it.