Energon shown in Transformers Prime; the series the game is based on

 The main Currency in the game. Energon is used to pay for weapons, armour, upgrades, spawns and to fuel weapons (ammo). Energon is the main resource in Transformers Universe. Players have to mine it to extract it from the ground. Terracon  may attack players attempting to mine Energon. It can also be earned by performing specific tasks, such as defeating other players.