How do I explain the evolution of slug people?

I got motivated to write a novel after reading about ocean slugs that managed to evolve into fish. In my fictional world I'm writing how a few fish shaped slugs made their way on land and managed to evolve into intelligent humanoids. In my novel two species of slug people evolved , the first kind are Benevolent that feed on plants and the second kind are Malevolent predators that feed on other slug people.

I'm wondering in what conditions could such beings have evolved and what unique language or form of communication would they have developed?

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How do I explain the evolution of slug people?

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