The Aeternae myrmidon was manufactured by House Vyre at the behest of House Ellowuyr as compensation for an unknown agreement. Aeternae myrmidons feature some of the latest Vyre innovations in warjack weaponry. They wield a pair of Distortion Voulges, massive bladed weapons that cause their enemies to reverberate with arcane energy and be repelled with each successful blow.

Most notable is the Aeternae’s shoulder-mounted Shatter Cannon, an insidious gun that fires a steel sphere payload faster than the speed of sound. Within these steel spheres is a unique type of crystal found only deep in the earth beneath Ios. When agitated by extreme impacts, the crystals begin to expand at a marvelously fast rate—a single handful of crystals will expand as large an adult Iosan in just a matter of seconds. Any enemy the sphere doesn’t simply pass through will find this payload lodged in their innards just moments before the crystal package within expands violently.