Three hundred years ago the shining towers and marvellous wonders of the Realm of Castles were embroiled in a war against fiends and fell sorcerers. All that remains are blasted ruins, crumbling citadels, and only fragments of memory from Before the Fall. No one is permitted to leave Castlemourn, and those who enter do so at their peril; adventurers, treasure hunters, and dedicated Questors scour the land in search of relics, artifacts, and clues to the past. Castlemourn is a post-apocalyptic fantasy setting where kingdoms fight for power through political intrigue and outright warfare; where the brave seek their fortunes in dangerous ruins; and where everyone fears the unspeakable evil that shadows the land. The Cortex System Quickstart contains a preview of the Cortex System Core Rulebook, with easy-to-learn rules, pre-made characters, and a short scenario, Escape from Blackoon, introducing players to the world of Ed Greenwood's Castlemourn. Enjoy the game as a one-time experience or use it to launch a new series of epic fantasy adventures!