Coriolis: The Great Dark, The Fractured Library and Other Tales From the Lost Horizon - Physical + Digital

Coriolis The Fractured Library and Other Tales From the Lost Horizon is an adventure collection for Coriolis: The Great Dark. It includes five stand-alone adventures that Game Masters can place anywhere in the Charted Sphere.

Preorder - October 2026 release

This The Great Dark adventure book sends Explorers on dangerous missions across strange and mysterious locations. Travel to a secret library station, investigate a forgotten moon filled with strange tones and wordless song, or examine deep-space Builder monuments where wonder and dread blur together.

Each adventure can be played on its own or incorporated into The Flowers of Algorab campaign. As a result, this book is a strong expansion for groups who want more Coriolis: The Great Dark scenarios, flexible session material and new discoveries from the Lost Horizon.

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Contents and features

Coriolis: The Great Dark, The Fractured Library and Other Tales From the Lost Horizon includes:

• 5 stand-alone adventures for Coriolis: The Great Dark
• Adventures usable anywhere in the Charted Sphere
• Support for incorporating the adventures into The Flowers of Algorab campaign
• The Fractured Library, escort a mysterious cryo-pod to a secret research station where an experiment has torn reality apart
• The Octagon of Khouri, help a mother find her estranged daughter in the sweltering jungles of Khouri
• The Temple of Tomorrow, investigate a towering ruin on a desolate moon before a rival gets there
• The Helesto Troika, safeguard a gazetier and an algebraist investigating a Builder monument in deep space
• The Singing Moon, investigate why Resonance Station Khepra has stopped transmitting and recover its lost data cubes
• The Kumaranti, a new Slipstream Cruiser with background description, crew and blueprint plans
• Complete PDF included via DriveThruRPG when purchased through Free League’s store

More about The Great Dark adventures

The Fractured Library and Other Tales From the Lost Horizon expands Coriolis: The Great Dark with flexible adventure material for exploratory science fiction campaigns. The missions range from research stations and jungle searches to ancient ruins, deep-space monuments and eerie lost transmissions.

In addition, the five adventure structure gives Game Masters useful material for one-shots, side missions or campaign arcs. Therefore, this book is a strong pick for groups that want more mystery, peril and strange discoveries in the Charted Sphere.