Etherion

Etherion, also known as "Satellite Square, Etherion", is an extremely powerful weapon controlled by the Magic Council.

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Tower of Heaven arc
In the Tower of Heaven arc, Siegrain tricks the council into firing Etherion at the Tower of Heaven in order to gather the 270 Million Edeas of magical energy required to activate the R-System. 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 has not been used since the Tower of Paradise arc. 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 hit the Lacrima crystals inside the Tower of Paradise, which absorbed its energy.

Powers
Etherion, once powered up fires a large amount of energy that will strike the target. The massive amount of energy (Fire Energy along with several other types of Elemental Energy) causes distortion and then wipes the target away, leaving only 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 the Dragon Force, even though Etherion is fused with other Elements as well. It did however have side effects later on, making him sick for days after.
 * Etherion shares it's name with the Ultimate magic in Hiro Mashima's earlier work Rave Master. It shares the same destructive capability with its namesake.
 * In Fairy Tail: Shooting Star, Guran Doma has installed a Portable Etherion Cannon in Subjugation Unit Number 7-777's core, as a final measure to make sure that Chall Factice is killed.