Killzone: Shadow Fall is a video game set thirty years after the events of Killzone 3, in a time of planetary colonization. The story focuses on the conflict between two rival colonist factions, the Vektans and Helghast, who have been separated by an enormous security wall for three decades. Players take control of Lucas Kellan, a member of the military intelligence unit dubbed Shadow Marshals tasked with protecting fragile peace between these two sides. During his missions he must be prepared to face all kinds of combat situations as any misstep could lead to mutual destruction.