Lawlessness reigns on the desert planet Pandora, and luck smiles only on the most bloodthirsty warriors. The four companions must find a great Treasure Vault filled with valuable weapons and other equipment. The Calypso twins, the leaders of the "Children of the Vault" cult, stand in their way. They want to find Pandora's treasure trove in order to appropriate everything for themselves. Together, the heroes will have to defeat the twins and get to untold riches. The creators call the Borderlands series a "loot shooter". This is a subgenre in which you not only need to shoot at enemies, but also look for special items for your character — the so-called loot. The better the loot, the stronger the character.