- Used to open the Crystal Bridge leading to the Sun Island by dropping it in the Spirit Lock.
- As of the ant update, the god bag was uncraftable. It was used to make it. But now it's used for the god bag due to the Mojo Update.
In the inventory, it has the appearance of only sparkles, unlike its actual appearance of a glowing orb. The Spirit Key is noticeably bigger than Essence and it gives off blue and white particles when dropped.
The Spirit Key looks almost invisible in your inventory with a few particles.
- Before the Magnetite Update, you could obtain the Spirit Key from defeating the Giant, however, it was changed so that you can now only obtain it from the Crystal Guardian.
- Due to its round shape, the Spirit Key can easily roll away which can be annoying if it falls off the Island 2nd Floating Island after defeating the Crystal Guardian.
- The Spirit Key used to have a log texture in the backpack.
- It used to be used in the removed God Bag recipe which was craftable at level 1000.
- For some reason the Spirit Key vanishes from your inventory when picked up, which means it must be manually dragged to the Spirit Lock to activate the Crystal Bridge.
- This was fixed in the Mojo Update.