Well, first of all, the Borderlands story has the Vaults as a major element. They are like magnets that attract all kinds of characters. Then there are the weapons. The vast array of guns in the Borderlands is not just for gameplay but also part of the story. Different guns have different backstories and significance. Factions also play a crucial role. They fight for power, resources, and control over the Vaults. And the relationships between the characters, whether it's friendship, rivalry, or enmity, are also key elements that shape the overall story.
The key elements include the concept of the Vaults themselves. They are not only the goal but also hold secrets that are central to the story. The diverse environments, from deserts to ice - covered areas, are also important as they present different challenges and resources. Also, the character development of the Vault Hunters as they gain experience and new abilities.