Endumium Crystals are items used as "currency", normally obtained by, and used for, trading with Farlanders . They can also be found in some structures and by mining Endumium Ore  .


Endumium Crystals can be used for trading with Farlanders, Elder Farlanders and Wanderers . They cannot be used to make tools. To trade with Farlanders, right-click them, and a trade menu will appear. To trade endumiums crystals with Farlanders, the player must place them into the trading menu's left slot in the amount requested above the slot. The player can then take the resulting item from the right slot. 

Endumium Crystals can also be used to craft a Block of Endumium  .