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The grind for resources never ends inOnce Human, and if you think manually gathering materials from resource nodes or enemies is tedious, there are other ways to gather precious supplies. As you’re adventuring, you may come across Blackfell Extraction Permits, and these are your tickets to some quick and easy materials.
Getting resources likeAcidorfuel for vehicles inOnce Humancan take a while, but if you use Blackfell Extraction Permits, you can get as much as you need from just one area. If you find yourself with a nice stockpile of permits, here’s how and where you can use them.

How To Use Blackfell Extraction Permits In Once Human
The description of Blackfell Extraction Permits states that they can be used to operate Blackfell Refineries, which are found all over the map. They have their own map markers, so they shouldn’t be hard to spot. You can use your Blackfell Extraction Permits to activate these Refineries (otherwise known as Workshops) and trigger a defense event where enemies will continuously spawn and swarm your position. Complete the event to get rewards.
One such refinery can be found in the Eastern Railway Junction POI in Broken Delta. Inside one of the depots is a Production Facility, which you can interact with and activate. This particular workshop yieldsAcidand vehicle fuel — the higher the rarity of the Blackfell Extraction Permit you use, the better the rewards you get. The duration of the event will also increase, however, sobring plenty of ammoand get ready for a fight.

Where To Get Blackfell Extraction Permits
As of writing, there’s no guaranteed way to get Blackfall Extraction Permits. You can obtain them as random drops when opening chests in Strongholds and Securement Silos, though the drop rates are very low. The best way to get permits is to simply explore Strongholds likeHolt Town inOnce Humanand make sure to get all the chests in them. Specifically, they can be obtained from Gear and Weapon Crates.
If you’re playing with a group, everyone who participates in the event will get rewards. Keep in mind that the incoming waves of enemies may be too much for a single player to handle. If you may, place traps, mines, and turrets to help stem the tide. Blackfall Extraction Permits will be consumed after they are used, so you’ll want to make sure that every run is successful.
