What is the skull key for in stardew valley?

The Skull Key is an item in the game Stardew Valley that can be used to unlock the Skull Cavern in the Desert. The Skull Cavern is a dangerous and challenging dungeon filled with powerful enemies and valuable loot.

The Skull Key can be obtained by completing certain quests, such as donating artefacts to the Museum or reaching level 120 in the mines. Once the key is in your possession, you can use it to unlock a door in the Desert that leads to the Skull Cavern.

The Skull Cavern is much more difficult than the regular mines, with tougher enemies and fewer resources. However, it also contains rare and valuable items, such as Iridium and Prismatic Shards. The Skull Key is essential for accessing this area and unlocking its rewards.