Crystals is a primary resource mined on all the asteroids of the Oort Cloud.
The player can use it to produce ammunition, construct buildings and also as a fuel for their asteroids to move them within the Oort Cloud.
To get crystals, the player can:
Figures in the top panel show the total amount of all crystals available on the asteroid. When warehouses are full, the figure turns red and crystals start disintegrating.