Emergence Day is a significant event in the fictional universe of the video game series Gears of War. It marks the day when the Locust Horde, a race of subterranean creatures, emerged from underground to attack humanity. This surprise assault led to widespread destruction and chaos, fundamentally changing the world and its inhabitants. The day is often remembered for the catastrophic loss of life and the beginning of a brutal war between humans and the Locust. It serves as a pivotal moment in the series, shaping the narrative and the struggles faced by characters like Marcus Fenix and his allies.