Energy
From Official Runecraft Wiki
Energy is the term we use in Runecraft to define the cost of each rune you use, on rune creation you get energy, and when using runes your energy decreases! How do you get energy? You get energy by creating runes or using the Aether Chest you use the Aether Chest by depositing items, each item gives different energy values, you can see all the energy values and tiers Here
