This mission involves reaching a vault guarded byThe Rampager, a huge, powerful monster.
you might enter the vault after defeating the monster.
Return toSanctuaryand meet withTannisto give her the key fragment.
Go to the bridge and listen to the conversation withRhysandLilith.
you gotta travel toNeon Arterial.
Return to theMeridian Metroplexregion onPromethea.
Your destination can be reached by car.
This will allow you to enter Neon Arterial.
you’ve got the option to now traverse a large portion of Neon Arterial.
To do so, useProject DD- a unique vehicle delivered by Ellie.
The route forks in several places, but all branches eventually lead to the same place.
In several places, you will be forced to defend the nearby area.
Fortunately, ground mines are harmless.
Soon, you’ll start to encounter opponents.
Watch out for Enforcers.
Watch out for Badass, enemies known for their ability to easily defeat your hero.
Soon after crossing throughGreen Diamond Platform, you will start to encounterGuardians.
If possible, attack them in order and watch out for their stronger versions (Possessed).
Continue exploring the caves until you reachThe Forgotten Basilica.
Enter the large hall and place the key on the pedestal.
This action will begin an encounter with a giant boss -The Rampager.
The battle with Rampager consists of three phases.
Duringthe first phase, Rampager focuses on attacks that use the fire element.
you could take a stab at avoid the fireballs or reach elevations at the sides of the arena.
The boss can also spit fireballs - in such cases focus on strafing.
There are four large columns in the area.
Use them while it’s possible for you to because they will be consistently destroyed by the boss.
Of course, Rampager attacks can easily knock down your hero.
Guardians also appear when Rampager attempts to climb the edges of the arena.
Once a boss loses 1/3 of his health bar, he becomes temporarily invulnerable and begins to transform.

Avoid attacking him, use the time to regenerate your shields or look for ammo.
From the start ofthe second phase, Rampager will destroy large pillars, making them unusable as cover.
Use those pillars which are still standing to avoid receiving serious damage.
During the second phase, Rampager uses a different element - acid.
When that happens, attack him with the most powerful weapons and skills.
The third phasebegins after Rampager has only 1/3 of his health bar left.
Same as before, he will transform - during that time, he will be completely invulnerable.
you’re able to avoid it by skillful strafing or simply running in the opposite direction.
The key to survival is to stay in constant motion because all the pillars are probably already destroyed.
Also, avoid finding yourself underneath the boss.
Remember, to use the best attacks after Rampager loses power.
The defeated boss will leave a lot of credits, eridium and valuable random loot.
Go through the portal leading to theVault of the Rampager.
Go forward and reach the location ofEridian Resonator.
From now on, it’s possible for you to destroy purple crystals by performing melee attacks.
Destroyed crystals will yield eridium bars (premium currency).
Interact with theLodestar terminal.
Go back to the area where you fought the boss and watch the cut-scene.
Talk toAvaand then use the fast travel option to reachSanctuary.
Meet on the bridge withLilithand other allies.
Don’t miss a secondary objective which involves talking to Ava in her cabin.
Finally, talk to Lilith once again.
You’ll also unlock a new storyline quest -Hammerlocked.
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