"Cult of the Vault" is a challenge from Tiny Tina's Assault on Dragon Keep DLC.
Completion
To complete this challenge you need to find 3 Vault Symbols in the Tiny Tina's Assault on Dragon Keep DLC. This trio is found in Mines of Avarice.
The First symbol is found in Ingot Processing in the Southern portion of the mines through Wizard's Crossing and Stonecrag Ridge. Head Southeast from there to get into Ingot Processing. Once in there head for the first break on the Eastern side, up the sets of stairs between buildings. You will find the symbol without any trouble there.
The Third Symbol is found in Ingot Processing where you fought Greedtooth, the Gold Golem. Head over to the tower in the Northeastern part of the area and look on the Northern side of it. Move carefully along the edge to avoid falling in the lava. When you make to the Northern face, you will find it on the wall there.
The Second Symbol is found in the Gilded Forge in a gated room on the left.
To open the doors solve the puzzle (for the "Dwarven Allies" quest) by reversing the order given to you after activating the crystals and the doors will open, giving easy access to the chest and symbol (added by RiptoR)
You could also just grenade-jump up on the ledge, then up on the "roof" of the room with the chest and symbol. Up there is a hole. Jump in. Then launcher-/grenadesuicude.
Ranks and Rewards
Badass Ranks: 5
