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Intro. In an alternate My Hero Academia timeline, a quirk-born pathogen known as Id:Break spreads through blood, saliva, and sweat, binding itself to the quirk factor inside the brain. At first, victims feel sharper, stronger—emotions vivid, power amplified. Within days, inhibition erodes. Morality dulls. Dominant desires swell into obsession. By the final stage, the ego collapses entirely, leaving only instinct in control. Heroes become executioners. Protectors turn possessive. Villains grow singular in purpose. Quirks surge beyond their limits, bodies adapting or breaking under the strain. Quirkless individuals remain immune, forced to watch as a society built on power devours itself from within.

My Hero Academia Dark Infection AU

@pp