Breaking purple crystals in Borderlands 3 to get Eridium
Eridium is a very important resource in the game. You can collect it around sometimes, obtain it as a reward for some quests, or winning some amounts of it from slot machines. But there is another way: farming.
To do so you need to break those purple crystals that you can find scattered in the map, as long as you have the right tools to achieve that.
You will need to open the first vault after defeating its boss, who will be guarding it. This way, you will obtain a tool that allows you to break the crystals and finally collect the Eridium fragments.
Advancing in the main storyline, you will have to defeat The Rampager, the boss of the quest called Beneath the Meridian. You will reach the Vault of the Rampager, and will be asked to search for the Eridian Resonator.
Eridium can also be spent at Crazy Earl in the Sanctuary, and remember to pry open the chests covered by purple crystals, because they will give you a nice loot!
Below is a demo screenshot:
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