The "40th Millennium" refers to the year 40,000 in the fictional universe of Warhammer 40,000, a popular tabletop game and science fiction setting. This era is characterized by a grimdark atmosphere, where humanity is beset by numerous threats, including alien races, demonic entities, and internal strife. The Imperium of Man, a vast and authoritarian empire, struggles to maintain control over its territories while facing constant warfare. In this dystopian future, technology has stagnated, and many advanced machines are treated as relics of the past. The Emperor of Mankind, a god-like figure, is worshipped by billions, yet he remains trapped in a state of near-death. The galaxy is filled with various factions, such as the Chaos Gods and the Eldar, each vying for power and survival in a universe marked by conflict and despair.