A Feast for Aliens

It's been six months since Fortuna colony was established on a moon in a distant solar system. The aliens who invited the colonists here have never shown themselves, but they've provided everything the human settlers need to thrive. However, after several people vanish without a trace, the colony leaders decide it's time to leave. But before they do, the aliens provide a final delicious meal for their human guests. What is the real reason the aliens invited the colonists to their world? All will be revealed at the final feast!