Attack on Titan Revolution: How to Use the Emperor's Key
Looking to open some Emperor's Troves?

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In Attack on Titan Revolution, the Emperor's Key is a type of Key that can be used to open the Emperor's Trove chest. When opened, this particular type of chest has the chance to drop items like the Titan Serum, Hardened Blade, and Attack Shard.
How to Get Emperor's Keys
To get Emperor's Keys, you'll need to purchase them from the market for 2,999 Gems.
To find the market, you'll need to head to the main spawn area and look for the large MARKET
sign:
You'll need to enter this area, and head to the market stall shown below:
You'll need to walk up to this stall and press the E
key, and then press the Market
button at the right side of the screen to open the market.
Next, you'll need to scroll to the PROGRESSION
section of the market menu. You'll then need to left click on the EMPEROR'S KEY
item to purchase it for 2,999 Gems:
How to Get Emperor's Troves
Once you've got an Emperor's Key, you'll then need to also have an Emperor's Trove to be able to use it.
To get Emperor's Troves, you'll need to complete Raids. To start a Raid, you'll need to walk to this bell found in the main lobby area:
Once you've reached the fountain, a menu should automatically open. You'll then need to select the RAIDS
option.
You'll then need to start any Raid which will reward you with 1 Emperor's Trove when completed!