The Third Horizon is a series of interlinked star systems far away from Al-Ardha, or Earth as we call it. Each system contains portals leading to the other systems in the Horizon. During the recent Portal Wars, all portals leading back to the First and Second Horizon were destroyed, plunging the Third Horizon into isolation and decay.

Years later, the long-lost arkship Zenith arrived from to the First Horizon. The colonists scavenged their ship, rebuilding it into the great space station Coriolis and declared a new era in the Third Horizon – a time for trade, reawakening and peace. They invited the older factions of the Third Horizon to join a council to address grievances between the people of the Horizon.

All would be well if not for the faceless Emissaries, arriving from the depth of the gas giant Xene. Spectres from another world, Icons or Portal Builders – what are they? They claimed godhood as Icons, and once again the Third Horizon is torn between the newcomers and the powers of old.

The star portals are dead. Ship City is dying.

But there is still hope.

You are Explorers in a dangerous world. You do the work few others will. The enigmatic ruins of the Great Dark are shunned by most, but not by you. You seek them out, to delve into their shadowy depths and uncover their secrets. The Blight – the cataclysmic scourge that spreads from the ruins – is your beacon. Where there is Blight, there are artifacts to find and mysteries to solve. Ship City is fading, but you and your fellow Explorers can find a way to a better future.

So don your delver suit, step aboard a mighty Greatship and venture down the Slipstream towards the unknown. Your creed: explore or perish!