Disc

Disc is a giant UFO super-weapon Artifact that belongs to the Union.

Overview
It resembles a massive, disk-shaped UFO, with the Union crest etched on it. It can shape-shift into a multitude of forms as a means of attacks, from small lasers to becoming a massive cannon to fire a devastating beam.

Gina Arc
Gina used the UFO to help locate an UMA alongside her own powers. During her fight with Andy and Fuuko, she uses it's laser functions to defeat the duo and then capture them. However, it's used against her thanks to Fuuko's Unluck making it go haywire and firing on her and Andy, which ultimately kills her.

Union Arc
In the 101st loop, a war is waged in Bujora, South America to locate the UFO, a superweapon called "Disc", between a mercenary group called Horizon Balance and Creed's militia. To save Tella, Creed, and Billy from their tragedies, as well as locate the artifact Remember, Fuuko and the Union ultimately stop the war between Billy's and Creed's superiors by stealing Disc. It is destroyed when Fuuko's Unluck causes it to falling on top Nico, taking out the whole island in the processes. Nico survives because Unluck targets only the "soul", which was separated at the time thanks to Ichico.