Your Vault Hunter will level up upon earning enough Experience Points (XP) that can be obtained by completing missions or killing enemies in Campaign mode.

Notice the yellow line around your Vault Hunter level? That indicates the current progress of your experience (XP). Once both ends meet, your Vault Hunter levels up.

Reaching a higher level grants a permanent increase to your Vault Hunter’s Power Score and Max HP. 

There’s actually no need to wait until you finish a mission because you can also level up on-field in real-time!

As your Vault Hunter’s level goes higher, you will also receive an increased amount of rewards from Vaughn’s Adventure.