Vault Cracker - Gold
Unlock the vault on Planet Thram.

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The Vault is large and silver and requires 6 Keys that are scattered in Planet Thram, The Vault is right beside where The Smuggler is when trading him horns for bolts. Acquire The Treasure Mapper as it is highly useful and it will reveal the whereabouts of the Keys and the Horns. This will be a 2-Step Search.

• Find all the Keys
  
• Find all the Horns

The keys will be in specific areas in the planet.

• 2 Keys are lying in plain sight
  
• 3 Keys require turning a bolt and powering a generator
  
• A key will be rewarded after delivering ALL horns to The Smuggler.

When turning the bolts that power a generator, a small cutscene will start and a battery bot will spawn in an certain area, There is limited time after activating the bolt, Rush to the bot then return back to the bolt and throw it in the generator then you'll receive the key.

Here is a 6-min clip revealing the places where the keys will be and getting them.