Synchro Summon was the first new Summoning Method introduced after Yu-Gi-Oh! entered the Master Rule era. In terms of both worldbuilding and story, it also represented Duel Monsters entering an entirely new realm.
Its summoning rules were actually very simple and easy to understand. Put plainly, it was just addition within twelve.
As mentioned long ago, many monsters in the Dueling World possessed potential that had yet to be developed. These monsters concealed the ability to extract their own Levels and combine them with the adjusted Levels of their companions. Monsters with such abilities were called "Level Tuners," or Tuner Monsters.
A Synchro Summon used one Tuner Monster along with any number of Non-Tuner monsters. As long as the combined Levels of all the monsters exactly equaled the Level of the Synchro Monster to be summoned, a Synchro Summon could be performed.
Just as Paradox was demonstrating now.
The Level Two Tuner Monster "Malefic Parallel Gear" synchronized with the Level 8 Non-Tuner monster "Malefic Stardust Dragon." Two plus eight equaled ten, so the corresponding Synchro Monster that could be summoned was Level 10.
Parallel Gear's body came apart, transforming into two green rings that encircled Malefic Stardust Dragon. Malefic Stardust's body became transparent, and the energy within it was drawn out, becoming eight connected stars.
The stars formed a line. A Light Pillar pierced the heavens, turning into a Starlight Road that descended straight to the ground. The dark dragon landed heavily, raising its head and unleashing a piercing roar that shook heaven and earth.
Malefic Paradox Dragon, Synchro Summon!
Malefic Paradox Dragon, ATK 4000
At that moment, the entire laboratory, Mokuba included, had gone rigid.
What the hell was that? What had this guy just done?
What happened to those two monsters? How had they turned into