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Chthonic Keys from Tartarus doors — guide illustration
Run currency rewards

Chthonic Keys from Tartarus doors

Keys unlock weapons and Mirror options, making them valuable early in account progression.

PC / Global release; full base game
WHERE & HOW TO FARM

Where to farm

Chthonic Key chamber rewards during escape attempts, with a possible Gemstones-to-Keys exchange at the Wretched Broker in the House.

A chamber door that displays a Chthonic Key awards one when you clear its encounter. Key rewards are among the blue-laurel options, but that grouping can also indicate other resources. If direct Key doors are scarce, the Wretched Broker may offer an upward trade from Gemstones.

GET STARTED

How to farm

Before you go

  • Begin an escape attempt and reach chamber choices.
  • Know whether you need Keys for a weapon unlock or another account option.
  • Have surplus Gemstones if you plan to consider a Broker trade.
  1. Inspect each chamber reward icon and select a door that specifically shows a Key when Keys are your priority.
  2. Clear the encounter and collect the displayed Key reward.
  3. Continue checking later chamber doors; do not assume the same reward appears at each fork.
  4. After returning to the House, inspect the Wretched Broker’s current offers if you still need Keys.
  5. Compare the Gemstones cost with planned House Contractor purchases before making an exchange.
  6. Spend Keys on the account unlock that prompted the farm.

Farming tips

  • Blue laurel groups several reward types; use the specific icon rather than the laurel color to identify Keys.
  • The Broker trades upward, so the exchange can consume a resource you may need for Contractor jobs.

Repeat, collect and use

Repeatable through later runs, though specific chamber rewards and Broker offers vary.

Common mistakes

  • Entering a blue-laurel room expecting a Key; verify the icon first.
  • Assuming Charon sells Keys; use chamber rewards or a listed Broker exchange.
  • Trading away all Gemstones before checking Contractor priorities; compare uses before exchanging.

When to stop or switch

Stop prioritizing Keys when the planned unlock is complete, then redirect chamber choices toward the next progression resource.

Sources & fact checks
REWARD DETAILS & CONDITIONS

Sources & rewards

Farming route

Chthonic Keys from Tartarus doors

Chthonic Key chamber rewards during escape attempts, with a possible Gemstones-to-Keys exchange at the Wretched Broker in the House.

  • Begin an escape attempt and reach chamber choices.
  • Know whether you need Keys for a weapon unlock or another account option.
  • Have surplus Gemstones if you plan to consider a Broker trade.
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