Adamantus

In the distant future, colonists on the planet Tranquility built settlements like idealized versions of Earth cities from the centuries before space exploration, where they lived peacefully until suffering a catastrophic environmental disaster, necessitating its forced evacuation. Now a small starcraft, long thought to have been lost, has inexplicably reappeared in orbit around Tranquility. As an agent of the Novan Federation, you have been ordered to board the vessel and investigate. What you find there is shocking and compels you to brave the poisonous miasma of the abandoned planet to unravel the mysteries of Adamantus.