Etherion

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

Tower of Heaven arc
In the Tower of Heaven arc,Siegrain tricks the council into firing it into the Tower of Paradise in order to gather the 2.7 Billion Ideas 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 "Thus we pray to the sacred light, Etherion Release!!", 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 it's path until it hit the Lacrima crystals inside the Tower of Paradise, which absorbed it's energy.