Black Key
Black Key is only worth carrying when your run is already strong enough to turn Fort Istria into a Dreadnought vault finish.
The value comes from what the key opens, not from the key itself. Lock type, likely route, and extraction risk decide whether it rides back to the Trampler. A key found far from its matching door is still worth saving when it opens boxes or rooms that regularly beat loose loot.
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Black Key is only worth carrying when your run is already strong enough to turn Fort Istria into a Dreadnought vault finish.
Blue Key only pays off when your Kaiserplatz stop was clean enough to justify pushing the chain one landmark deeper.
Dreadnought Key is a separate Storm Dive endgame key, so it only matters when your run can still survive the ship and the extraction after it.
Green Key only matters when you are ready to turn a safe drop into the first real landmark step of the colored chain.
Keys are route commitments, because each useful key only pays off if the crew can still reach its exact box, door, fort, or vault before the run collapses.
Red Key only deserves space when your run is still strong enough to keep climbing toward White Key instead of extracting profit now.
White Key only matters when your run can still turn Segen into a Fort Istria finish instead of dying one step before Black Key.
The key worth carrying is the one with a matching box, colored door, or landmark room on the route. Without a lock to open or a better run to save it for, that slot is usually stronger as ammo, materials, or valuables.
Keys that match the route or a known lock type come first. If the matching landmark is not on the route, rare keys are worth saving only when cargo space is safe and combat supplies are already covered.
Box keys and colored door keys solve different problems. Box access is easier to value during a loot run, while door access can change which rooms or landmark sections are reachable.
A key has no combat value while enemies are pushing. Spare keys belong in safe storage when possible, and they lose priority when they replace ammo or repair parts that keep the haul alive.
A rare or route-critical key can justify extraction when the matching lock is not safe right away. Losing the key in an extra fight can cost more than skipping one more container.
Yes, keys that open boxes, colored doors, or route rooms are worth keeping. Low-confidence duplicates only lose priority when supplies or rare materials need the slot.
Immediate use makes sense when the matching lock is on the route and there is enough ammo to fight out. Saving it is safer when the matching landmark is not safe or not nearby.
No. Colored keys are route-specific access items, so the door or landmark path they open matters before risking them in another fight.
Keys can replace low-value loot, but they cannot beat ammo, repair parts, or materials needed for a planned upgrade.