Descent 4

From Red Faction Wiki

Descent 4 was a title in development by Volition starting sometime between 1996-1998, and subsequently being cancelled around 2000. It was to be the fourth title in the Descent series, and a sequel to Outage Entertainment's Descent 3. Much of the engine work, and some of the assets that had been developed for Descent 4 would eventually be repurposed in Red Faction.