Essence

Player Essence is an item currency issued when an eligible player joins FortressMC. One item becomes available every 20 hours. It resembles an ender eye named “Player Essence”, but it is distinct from the ordinary eye of ender used to locate end portals.

Player Essence is used to refuel exile pearls and to complete many factory investments and production trades. Crafting one essence with an exile pearl restores that pearl to its maximum fuel duration of 48 hours, regardless of its remaining fuel.