Warhammer 40,000: The Horus Heresy is the Perfect Setting for a Game

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Over the last 40 years, Warhammer 40,000 has grown in scale exponentially. When playing the tabletop game today, players have the choice of a plethora of factions, each with their own slew of unique units, vehicles, and leaders. Further, for each new unit a faction receives, a new bit of lore is added to the Warhammer 40K timeline. After four decades of additions, the Warhammer 40K universe is a sprawling one, with some of the most fleshed out lore of any sci-fi fantasy franchise.

While some pieces of Warhammer 40K lore have been tweaked over the years, there are a few distinct events that have remained largely the same, but have just been fleshed out via books and codices. The Horus Heresy is one such event. Taking place just before the current Warhammer 40K timeline begins, the Horus Heresy is the catalyst for much of the universe's action, directly explaining the state of the Imperium of Man and the forces of Chaos.

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Taking place over nine Earth years, the Horus Heresy is a human civil war which sees the Imperium of Man split into two distinct sides: the Emperor's Loyalists and the fallen Space Marine Primarchs led by Horus. This pivotal event begins when the Space Marine Primarch Horus is corrupted by the Chaos Gods.

One of the 20 genetically-engineered sons of the all-powerful Emperor of Man, Horus was the Emperor's favorite. Upon being corrupted by the four Chaos Gods, Horus took his loyal Space Marine legion — the Sons of Horus — and turned on the Emperor, seeking his throne at the head of the Imperium.

Being the Emperor's right-hand man, Horus was able to convince about half of the Primarchs, his «brothers,» to betray the Emperor alongside him. The nine