What are Earth Crystals used for

ID	Cubie	Blueprint	Name	Tier	Recipe	Print Time	Release Date	Release Year	Category	Event	Released	Blueprint Counts	Flavor Text	Will Return	First Print Date	First Print Player	Notes	Notes	Notes	Animation
34			Earth Cubie	Rare	2000 Green Paint2000 Earth Crystal1 Earth Heart2000 Resin	10 min	September 6, 2021	2021	CHW	Elemental Invasion Event	Elemental Invasion Event September 6, 2021	1700	The clearest way into the Cubiverse is through a forest wilderness.	No	September 7, 2021	Roman		This Cubie Blueprint was exclusive to the 2021 Elemental Invasion Event and will not return. There are 1700 of this Blueprint in the game that were collected that year.		View Animation