Eridium in Borderlands 4 is something you'll collect during your time in Kairos, and something most veteran Borderlands players are familar with. Now, the real question is what do you use Eridium for?

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Eridium is a rare material in the world of Borderlands 4 that you use as currency to pay for specific services. Since you won’t find lots of Eridium just waiting for you or an infinite farm location, ...

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