Eisei Mahōjin : Ēterion
Tower of Heaven arc
Stated to be a nation-destroying Magic that is capable of transcending space-time, Siegrain tricks the Magic Council into firing Etherion at the Tower of Heaven (in order to gather the 2.7 billion Edeas of Magic Power required to activate the R-System), by stating that Jellal plans to use the Tower of Heaven to resurrect Zeref. After a session of re-voting, during which the Magic Council voted to use Etherion (much to Yajima's chagrin), the preparations to fire Etherion begin, which take one full hour. 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 Tower of Heaven. Once the preparations are finished, a blinding beam of light is shot down, decimating all in its path until it hits the Lacrima crystals inside the Tower of Heaven, which absorb its energy, successfully turning the Tower of Heaven into the R-System. Natsu later eats the Etherion-infused Lacrima of the R-System, prompting him to enter Dragon Force.
Etherion, once successfully prepared, fires an extremely large, destructive beam of Magic upon the desired location (said Magic contains Fire Magic, among other elements), that completely obliterates the target area, leaving only dust behind.
- Natsu Dragneel, a Dragon Slayer (who can restore his energy by eating his specific Element), was able to eat Etherion and enter the ultimate state a Dragon Slayer can attain: Dragon Force, even though Etherion is fused with Elements aside from fire. The consumption of the other elements, however, left Natsu incapacitated for days.
- Etherion shares its name with the Ultimate Magic in Hiro Mashima's earlier work, Rave Master. It shares the same destructive capability as its namesake.