In the sewers beneath the village, the rats lived in close proximity to toxic sewage and chemicals that leaked into their environment. Over time, exposure to these toxins caused mutations to occur in the rats' bodies, making them larger and more intelligent than typical rats.

One day, a shipment of particularly dangerous chemicals was dumped into the sewers, contaminating the water and air even further. Rupert, who was already larger and smarter than the other rats due to previous exposure, was further mutated by the increased toxicity. The change in Rupert's brain was so extreme that it caused him to develop a vengeful and sadistic personality, leading him to seek revenge on the humans who had caused the death of his family and colony.

As Rupert continued to consume the toxic chemicals, his mutations became even more pronounced. He grew even larger and his intelligence increased to the point where he was able to outsmart and manipulate humans. This, along with his insatiable thirst for vengeance, allowed him to control the minds of the villagers and turn them into mindless servants.

Eventually, the Avenging Mutant Rat's reign of terror was brought to an end by a heroic exterminator, but not before the once peaceful village was forever changed by the rat's mutations and toxic influences.
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