Before the Rising, humanity imagined countless scenarios for alien invasion: colossal spaceships blotting out the sun, monstrous creatures erupting from our bodies, and devastating technologies we couldn’t comprehend. But no one expected the attack to come from beneath our very feet. Instead of descending from the skies, the aliens awoke the dead beneath us. Nearly a hundred years have passed since the Krions—a cunning and ruthless alien species—triggered the Rising, unleashing Earth's undead as their first wave of attack. Humanity has long abandoned the surface, now living in colossal sky bases called Citadels, where survivors struggle daily against the relentless threat. Clinging to survival and the last vestiges of hope, humankind wages a brutal war from above against the Krions and their relentless, reanimated soldiers. Max, a young scavenger with nothing but his sister and a fierce drive for vengeance, scrapes by in the Citadel's slums. Fuelled by memories of loss and a burning hatred for the Krions, he seizes his chance to fight back by joining the Sentinels, an elite force of superhuman warriors clad in powerful armor and trained to combat humanity's greatest nightmare. Journey with Max as he faces deadly foes, perilous landscapes, and mind-bending horrors, fighting alongside fellow warriors in a desperate struggle to defend humanity’s last stronghold—and reclaim what was lost.