A new kind of element is added to Borderlands 3 with the release of Bounty of Blood DLC. Known as the Green Crystals these Borderlands 3 Bounty of Blood can not be broken right away. You need to progress at a certain point before you can get the ability to Break Green Crystals in Borderlands 3 DLC.
How to Break Green Crystals in Borderlands 3
These Crystals come around early in the Bounty of Blood DLC. You will find them scattered around multiple locations and as you progress the story you learn how to break them open. To destroy the Green Crystals you need to follow the main story of Borderlands 3 Bounty of Blood DLC until you reach the Ashfall Peaks. Keep playing until you get to the point of meeting Titus.
Our boy Titus is in trouble and needs your help getting out of the wall. The wall is covered with the Green Crystals. Have a conversation with Titus and he will tell you what happened and how get got locked behind the wall. Once you end the dialogue, he will give you a new company tech. After the brief tutorial on how to use this new tech, you can go to the wall and melee the Green Crystals to break free Titus. From that point forward, you can use melee attacked to break the Green Crystals in Borderlands 3 Bount of Blood DLC. Whenever you see then blocking your path, use a melee attack to rid of the crystals.
If you need more help with the game check out the Borderlands 3 Wiki page.