The Void Key in "Crash Continent 2" is a relatively easy-to-use jewelry in the game. It is a very good amplification jewelry. If you want to obtain this jewelry, you can first complete the Invisible Flower Mission, and then do the Slug Baby Mission. Then you can obtain the Void Plate, and then you need to complete the Void Search Quest.
How to get the Void Key in the Crash Continent 2