Sure! Here's a possible backstory on how the rats became mutants:

The village was built near a toxic waste dump site, and the sewage system beneath the village was contaminated with dangerous chemicals and pollutants. Over time, the rats living in the sewers became exposed to the toxic fumes and pollutants in the waste, causing mutations in their DNA. These mutations caused the rats to grow larger, become more intelligent, and develop new abilities and instincts.

Rupert, the rat who would eventually become the Avenging Mutant Rat, was born with a particularly advanced mutation that gave him an exceptional level of intelligence. He was able to survive and thrive in the harsh and dangerous conditions of the sewers, and he quickly rose to become the leader of his colony.

However, when Rupert's family and colony were exterminated by the village exterminator, the exposure to toxic waste and the loss of his loved ones combined to trigger a radical change in Rupert's brain. His thirst for revenge became all-consuming, and he used his newfound powers to exact revenge on the village and enslave its inhabitants.

Thus, the Avenging Mutant Rat was born, a dark and sinister force driven by an unquenchable desire for revenge.
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