The Kallidahin are a race of short, thin-bodied cetaceanoid humanoids native to the planet Kallidah. A small group of Kallidahin emigrated to the shattered remains of the planet Polis Massa, and eventually came to call themselves Polis Massans. According to research done by the modern Polis Massans, the native Polis Massans lived beneath the planet's surface and were known as Eellayin, but that species is considered extinct now.

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