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Red in color, these beautiful gems get their power from the distilled souls of your enemies.They are needed to build and upgrade all your buildings(Crystal mines do not require crystals to be built)
Grey in color and born of the land, Iron is used to power up your industry by making ammo for your towers.
Green in color and born from the death of all plants, Wood is mainly used to produce arrows. Should not looked over even if it doesn't seem impressive.
Made in steel factories from 2 units of unprocessed wood and 1 one of iron it is vital for making arrows. Currently not found naturally in the world