Etherion

The "Satellite Square: Etherion" (衛星魔法陣・エーテリオン Eisei Mahōjin : Ēterion), best known as Etherion (エーテリオン Ēterion), is an extremely powerful weapon controlled by the Magic Council.

Tower of Heaven arc
In the Tower of Heaven arc, Jellal Fernandes tricks the Magic Council into firing Etherion at the Tower of Heaven in order to gather the 2.7 billion Edeas of magical energy required to activate the R-System. The preparations to fire Etherion takes approximately one hour. It has been called a destruction Magic that transcends time and space, and some of the Council members mention that it is powerful enough to make an entire country disappear. It is fired after a group of Mages under the Council's control chant an incantation, ending with "We pray to the sacred light, Release Etherion!!", causing a series of glyph-like circles and squares to appear above the target, where the main beam is formed. Once the beam is finished, a blinding light is shot at the target, decimating all in its path until it hits the Lacrima crystals inside the Tower of Heaven, which absorbed its energy.

Powers
Etherion, once powered up, fires an extremely large amount of Magic that will strike the target. The very massive amount of Magic (Fire Magic along with several other types of Elemental Magic) causes distortion and then wipes the target away, leaving only nothing but dust.

Trivia

 * Natsu Dragneel, a Dragon Slayer (who can restore his energy by eating his specific Element), was able to eat Etherion and activate the Dragon Slayer's Ultimate Form, Dragon Force, even though Etherion is fused with other Elements as well. However it did have side effects as it makes him sick for days.
 * Etherion shares its name with the Ultimate Magic in Hiro Mashima's earlier work Rave Master. It shares the same destructive capability with its namesake.