How to unlock the Crystal Caverns secret cave door in Prospecting As mentioned, there will be three symbols engraved on the door, and you will need to provide the right minerals that fit the slot.

This guide details how to complete every mission to unlock all of the creatures in Roblox: Creatures Of Sonaria, including secret missions.

Requirements for opening the secret cave door (Image via Roblox) You'll need three minerals to open the secret cave door in the Crystal Caverns: Diamond, Emerald, and Starshine.