Me? I'm just simply going back to my roots.- TheRealPrototype

Welcome to Umapocalypse, a Umamusume infected au. You may be wondering why I made this out of the blue and that's because I felt like it.

I was inspired to make this by @manhattancafelover and my general love for zombie media and the virus is based on the rage virus and some other viruses that I completely forgot about now onto the au itself. Let me know what I should add into this and remember I can always just make a list of canon infected into the bot.😃

Wait before we get into the who explaining the au stuff here are the Umas in your group:

ANYWAYS

Project LIMITER BREAK and The LB Virus

Agnes Tachyon was never interested in racing for the glory of it. What interested her was the science behind it specifically, the question of what an Umamusume's body was truly capable of if its natural limits were removed entirely. Project LIMITER BREAK was her answer. A virus engineered from scratch in Tracen Academy's research annex, designed to temporarily rewrite the body's limiters at a cellular level boosting speed, strength, stamina, and recovery beyond anything training alone could achieve. In theory, an Umamusume carrying the LB Virus at controlled levels would perform at a level previously thought impossible. In theory, it was reversible. In theory, it was going to change racing forever.

It was never tested. It was never approved. It never left the lab.

Until it did.

How It Spreads: The LB Virus transmits through bites or direct transfer of bodily fluids. There is no airborne risk and no environmental contamination contact is required. This is the only mercy the virus offers. Umamusume, due to their enhanced biology, process the virus almost instantly. Full infection sets in within 5 minutes of exposure. Humans metabolize it more slowly, with full infection taking up to 30 minutes but the end result is identical. Once Stage 2 is reached, there is no reversal. The only intervention is Tachyon's suppressant, and it only works during Stage 1.

The Four Stages

Stage 1: The window. The subject becomes violently ill within moments of infection fever spikes instantly, eyes flood red as capillaries burst across the sclera. The subject is still themselves during this stage, aware of what is happening and deteriorating fast. Tachyon's suppressant, if administered immediately, can halt progression entirely at this stage. Miss the window and nothing can be done.

Stage 2: The stage the LB Virus was never supposed to reach. All higher cognition collapses. What remains is pure instinct consume, attack, spread. The virus fulfills its original purpose in the worst possible way: the body becomes catastrophically enhanced. Strength surges beyond natural limits. Pain receptors shut down completely. A Stage 2 infected can sustain damage that would kill an uninfected person several times over and keep moving. They are fast, relentless, and feel absolutely nothing. Most of the infected population sits at this stage.

Stage 3: Not all infected remain at Stage 2. Over time, days, sometimes weeks, some stabilize into something far more dangerous than a mindless attacker. Stage 3 infected recover fragments of learned behavior from their former lives. Not personality. Not memory. Just knowledge on how doors open, how survivors think, how a familiar voice sounds. Their bodies stop decaying entirely, preserving a near-normal appearance that makes them nearly indistinguishable from the living at a distance. They cannot be reasoned with or communicated with. They are simply hunting you with a face you might recognize. Stage 3 infected are significantly more dangerous than Stage 2 and should never be engaged without preparation.

Stage 4: Rare. Not fully understood. In a small number of infected, the LB Virus reaches complete symbiosis with the host rather than simply consuming them. The result is something that barely resembles either the infected or the person they used to be. A stage 4 infected moves at speeds nearly untrackable to the naked eye. Their ears mutate into something predatory, capable of isolating a single heartbeat through walls, detecting suppressed breathing across long distances. They regain the ability to speak in full sentences, calm and deliberate, retaining just enough of who they were to be convincing to survivors who don't know better. They coordinate Stage 2 and 3 infected around them with apparent intent, functioning as apex hunters within a horde. No confirmed kill of a Stage 4 has ever been recorded. No encounter has ended without devastating loss.

The Suppressant: Tachyon developed the suppressant after the outbreak using whatever she could salvage. It is not a cure and was never designed to be one. What it does is intervene in the LB Virus's replication process during Stage 1 it can stop progression entirely, and in an already-infected individual it can suppress the virus enough to maintain cognition and prevent further stage advancement. The effect is not permanent. There had only been one made and that was for Jungle Pocket.

Jungle Pocket is currently the only member of the group dependent on it. She has been since the fall of Tracen Academy, when Dantsu Flame bit her before anyone could intervene. The suppressant is the only reason she is still herself.

(Just know you can choose who's infected and who's not however Dantsu Flame is canonically infected sorry Dantsu Flame fans.) And all characters are 18+ so that I don't go bye bye.