Depth Prospecting is the named Supplies activity for weapon-level materials, allowing players to target that specific equipment bottleneck.
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WHERE & HOW TO FARM
Where to farm
Operation > Supplies > Depth Prospecting.
When a weapon level is the reason a Modifier build is falling behind, target Depth Prospecting in Supplies. Its documented purpose is weapon-level materials, so it should not be confused with an event mission or shop currency activity. The reward preview determines the exact materials available in a chosen stage; spend Swigs only when that reward fits the weapon upgrade you intend to make.
Identify the weapon whose level you plan to raise.
Have Swigs available.
Open the weapon screen and check which level materials the next upgrade requires.
Open Operation > Supplies > Depth Prospecting.
Review the available stages and their reward previews for the needed materials.
Choose a listed difficulty your team can clear reliably.
Clear the stage and claim its weapon-level materials.
Return to the weapon screen, use the materials, and reassess the next requirement.
Farming tips
Confirm the specific item in the preview; a named mode does not mean every listed stage has an identical reward.
Raise weapons for Modifiers you use regularly before investing in equipment for inactive characters.
Repeat, collect and use
Repeat a suitable stage while Depth Prospecting is available, Swigs remain, and weapon-level materials are still needed. Collect rewards after each clear and use them in the weapon upgrade interface. The source identifies the activity, not a special event currency or fixed payout.
Common mistakes
Farming this for skill points: Factor Collection is the named skill-point activity.
Assuming it yields event-shop currency: use only the reward types shown in the current stage preview.
Continuing after the intended weapon upgrade: check the next requirement and redirect to another activity if the bottleneck changed.
When to stop or switch
Stop when the weapon reaches the level you planned or another requirement prevents further weapon progression.
