When I started writing my second volume, I realized the possibility that the Young Guardians could become so effective at fighting crime that the criminal underworld would become desperate for a way to even the odds against the Young Guardians. For that, I had the criminal underworld develop an experimental performance enhancer that they call Steroline, which is a hybrid word between steroids and adrenaline. What this drug does is temporarily increases the strength, speed, endurance, and pain resistance of an individual. It can potentially multiply a user’s physical capabilities by ten for a span of ten to fifteen minutes. But when used in large doses, it can cause a person to go berserk, or potentially kill a person. When coming up with this drug, I drew inspiration from the Viking Berserkers, who were capable of entering such an intense state of rage that they would become inhumanly strong and resilient. With that in mind, I wondered what would happen if the Young Guardians encountered individuals who attained such ferocity. In later works, it will be revealed that Steroline will be the first piece to a larger puzzle.