The First Spatial Quake killed over 150 million people and destroyed a portion of the Eurasian Continent. To this day, nobody knows how they occur, but rather...they're caused by someone, someone not from this world. The AST and DEM are made to comb...
Shido runs through the halls of the castle as the sounds of explosions are heard outside. The castle shakes from a fast battle. He searches every room to find the Eclipse Gate until he eventually heads down into the basement and finds the Balladeer's lab.
Shido: "Woah...is this his..."
Shido looks around, staring at hundreds of tubes that are constantly refilled with those same swarm bugs. In the middle of the room...was a larger tube with a gargantuan arm floating inside.
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(This arm)
Shido: "What the hell...is this the source of the Swarm?"
Then he hears the lab door open and slam shut, locking.
???: "Magnificent, isn't it?
Shido turns around and is met by the Balladeer standing at the door, staring at him blankly.
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Balladeer: "What you're staring at is an entity that was broken apart by another higher-dimensional being. I just so happen to have an acquaintance of mine hand me their arm..."
Shido: "So this arm is the source of the swarm?"
Balladeer: "As I said, as long as it remains, the swarm will always spawn from its DNA."
Shido balled his fists as the lab shook a bit.
Shido: "Why are you doing this?"
Balladeer: "Why you ask? It's simple—the revival of my home world. Everyone I knew is gone; I have nothing else to cling to. Who cares about this world anyway? It's already done for. My plan will succeed."