The Unforge Key, often known in the community as the Unknown Key, is a special quest item in The Forge, one of Roblox’s most popular mining adventures. Players need this key to open a hidden gate deep inside Stonewake’s Cross. The key does not boost your stats directly, yet it unlocks a major progression point for mid-to-late-game mining. This guide explains what the key does, how to get it, and how to reach the cave it unlocks.

What is the Unforge Key in Roblox?

The Unforge Key serves one purpose. It opens the large locked gate that leads to the Fallen Angel’s Cave in The Cave mine. This cave sits inside Stonewake’s Cross, the first island and the first mining zone you explore. The gate looks like a giant iron entrance, and many players pass by it early without knowing it becomes important later.

Once you open the gate with the key, you gain access to the Arcane Pickaxe. This pickaxe stands out because it offers strong mine power, bonus mining speed, a major luck boost, and three rune slots. It ranks as one of the best pickaxes before you reach end-game tools like the Demonic and Magma Pickaxes. Although you can open the cave early, the pickaxe costs a large amount of gold, so most players buy it only after progressing further.

How to get the Unknown key in Roblox The Forge

You can get the key only through Bard’s Lost Guitar quest in Stonewake’s Cross. This quest is quick and available from the start.

Speak with Bard to begin the task. From there, enter The Cave and take the left path to reach an undead chamber. Inside that room, you will find the Lost Guitar next to a skeleton. Hold the E key to pick it up.

After grabbing the guitar, return to Bard. Completing the quest gives you the Unknown Key along with the usual experience and quest rewards. The key appears once you hand the guitar back, and you need it only once because it unlocks a single gate.

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How to use the Unknown Key in The Forge

To use the key, return to The Cave in Stonewake’s Cross. Move through the main section of the mine and head toward the right path. Follow the first arrow you see. This route leads directly to the locked iron gate.

Stand in front of the gate and hold E to use the key. The door opens immediately, and the key disappears from your inventory since it is a one-time item. Behind the gate, you will enter the Fallen Angel’s Cave.

The game does not place enemies or puzzles inside the cave. It exists for a single purpose: to hold the Arcane Pickaxe. You can approach the pickaxe and view its stats, but you must pay a high amount of gold to purchase it. Many players unlock the cave early and then return later once they have enough resources.