How to Use the Unknown Key in The Forge

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Last updated on December 17th, 2025 at 12:15 pm

The Unknown Key is one of the most important hidden items in The Forge, especially if you want to unlock the Arcane Pickaxe, one of the strongest mining tools in the mid and late game.

Since this item is tied to a secret cave and a missable quest, many players either overlook it or don’t know where to use it.

This guide explains how to get the Unknown Key, where to use it, and what it unlocks inside the caves.

Where to Find the Unknown Key in The Forge

The Unknown Key is the final reward for completing Bard’s Lost Guitar Quest in Stonewake’s Cross.

Here’s how to get it step by step:

Talk to the Bard NPC
You’ll find Bard beside the campfire at Stonewake’s Cross. Interact with him to start the quest.
Enter the cave near Bard
Head inside the Stonewake’s Cross cave and keep to the left path.
Reach the Undead Chamber
This area has skeleton enemies. Look for a skeleton lying on the ground near the chamber entrance.
Find the Lost Guitar
The guitar is placed beside the skeleton. Hold E to pick it up.
Return to Bard
Bring back the Lost Guitar to Bard.
Reward: You receive the Unknown Key.

This key is the only way to enter the locked chamber deeper inside the Inner Cave.

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How to Use the Unknown Key in The Forge

Once you have the Unknown Key, you must head into the Inner Cave, which branches off the main Stonewake’s Cross cavern system.

Here’s how to use the key:

Go deeper into the Inner Cave
Follow the right-side tunnel and continue until you see directional arrows painted on the cave walls.
Follow the first arrow
This arrow leads you straight toward the locked gate.
Find the Fallen Angel’s Cave gate
The gate is sealed and cannot be opened without the Unknown Key.
Use the Unknown Key
Stand near the gate and hold E.
The key will unlock the door and grant you access to the hidden chamber.

Inside the Fallen Angel’s Cave, you will find the path that leads to the Arcane Pickaxe.

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Why the Unknown Key Is Important

Unlocking the Fallen Angel’s Cave grants access to the Arcane Pickaxe, which is one of the best tools in the game because:

• It has high mining speed
• It gives increased luck for ore drops
• It has three rune slots, making it extremely customizable
• It is a major upgrade over early and mid-game pickaxes

If you are planning to farm rare ores like Demonite, Magmaite, Fireite, or Darkryte, the Arcane Pickaxe makes the grind significantly faster.

FAQs

Q1. Does the Unknown Key break after using it?

Yes. The Unknown Key is a single-use item. Once you open the Fallen Angel’s Cave gate, the key disappears permanently.

Q2. Can you reach the Arcane Pickaxe without Bard’s Quest?

No. The locked gate can only be opened with the Unknown Key, and the only way to get the Unknown Key is by completing Bard’s Lost Guitar quest.

Nishant Singh

Nishant Singh is a gaming writer with a passion for Roblox and the Call of Duty franchise. He enjoys exploring new titles, sharing tips, and writing stories that bring the gaming world to life.