This year's Festival of the Lost adds Cipher Decoders to Destiny 2, and this guide details the fastest way to farm this new currency.

But once you report back to Eva after using your Cipher Decoder, things get a bit more complex. To get all the rewards during the Festival, you’re going to need 45 Cipher Decoders.

Destiny 2 Cipher Decoders are used to unlock Encrypted Caches in the Festival of the Lost Haunted Forest. So let's explain Cipher Decoders, how to get them in Destiny 2, and their impact in the game.