How to Use Eridium in Borderlands 4
The mystical ore called Eridium is central to the lore of the Borderlands series and has always played an essential role in its endgame. This remains true in Borderlands 4, where Eridium is used for several valuable endgame progression and farming purposes.
Eridium has three main uses in the endgame of Borderlands 4, and you’ll need to be judicious about how you use it, as they can get exceedingly expensive:
- Respec your Specializations. Cost: 5,000 Eridium per instance.
- Activate the weekly Moxxi’s Big Encore machine. Cost: 100 Eridium per instance.
- Use the Firmware Transfer machine. Cost: Variable.
Spend Eridium to Respec Specializations
Specializations are unlocked in the endgame, providing permanent upgrades to your characters that can scale infinitely. Since 5,000 Eridium is a substantial amount, it’s important to be intentional about where you spend your Specialization points.
One or two points may not offer a massive upgrade immediately, but they accumulate over time. Keep in mind that Specializations are build-agnostic and might not work well with every setup. If you decide to completely respec your character into a new build, you might end up spending that 5,000 Eridium — or risk losing a significant chunk of DPS.
Spend Eridium to Use Moxxi’s Big Encore Machines
Moxxi’s Big Encore machines are an exciting endgame feature that rotates weekly. They allow you to fight a select boss out in the world again with, according to Gearbox, “an even more rewarding loot pool.”
For example, if you want to fight The Bod, you’ll need to wait for Axemaul to be the featured Big Encore boss, and so on. Don’t underestimate the 100 Eridium cost per instance either. Even with increased drop chances, RNG can be cruel—you could easily spend 10,000 Eridium and not get the item you want.
Spend Eridium on Firmware Transfers
The Firmware Transfer machine is the third major way you’ll spend Eridium. While not as frequent as the other two uses, it can still consume a significant amount of resources. Costs vary depending on the type of gear to which you’re transferring firmware.
If you use this machine regularly, it can quickly deplete your Eridium reserves.
How to Get More Eridium in Borderlands 4
Most missions in the game award at least some Eridium, and killing Vile enemies and world bosses also provides a modest amount. However, the most effective way to obtain Eridium is by completing Vile Bounties.
You unlock access to Vile Bounties once you activate Ultimate Vault Hunter Mode. These are higher-difficulty Vile enemies found and killed in the overworld. Each kill grants a modest but significant amount of Eridium instantly, usually several hundred when leveling, with increasing rewards as you progress deeper into the endgame.
You can also farm Eridium somewhat efficiently by completing weekly Wildcard missions, provided you can finish them quickly. While these won’t give you as much Eridium per hour as Vile Bounties or base patrols, they still add up.
It’s likely that an activity with a better Eridium farm will be introduced within the first few DLC cycles. This will be necessary, as Borderlands DLCs historically add increasingly powerful Legendaries as the game’s life cycle progresses.
https://www.shacknews.com/article/146107/what-do-you-use-eridium-for-in-borderlands-4
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