How to Use the Mysterious Key

Chorizo gives you a Mysterious Key that leads to an unknown destination. Read on to learn how to use this key, and the rewards that you can unlock!

How to Use Mysterious Key

The Mysterious Key is an item given to you by Chorizo. It can be used to unlock a secret treasure located in a small island in Isla Santuario. The key can be viewed in your Inventory as a part of your Logistics items.

Go to Guau-Guau Island

One of the clues that the Mysterious Key offers are the words Guau-Guau written on the side. This refers to Guau-Guau Island, which can be found in the middle of Casas Cove in Isla Santuario.

The quickest way to travel to this Island is by swimming from Armonia, which you can reach using fast travel. Upon arriving in the island, travel to the center until you reach a camp where a huge treasure chest is located.

Obtain the Secret Treasure

Upon reaching the chest, you can use the Mysterious Key to open it and receive a special reward.

Guau-Guau Island Unique Weapon

You will receive a unique weapon, a rifle called Fuck Anton. This is a weapon that fires poison rounds, making it a strong weapon to use against soft targets.

All Unique Weapon Locations

How to Get Mysterious Key

Complete Fetch Quest Yaran Story

To acquire the Mysterious Key, you need to complete the Fetch Quest Yaran Story. This involves following Chorizo around the Guerrilla camp, and acquire different kinds of items along with a key.

Fetch Quest Mission Walkthrough

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Complete Story Walkthrough

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