It is a horrible era for the formerly peaceful town of Tristram. The young Prince Albrect is missing, King Leoric is dead, and demonic raids are now commonplace. You are one of the heroes, who has visited Tristram, seeking fame and fortune for slaying whatever is causing this horror. However, the sleeping Evil sees in you what it most desires: Freedom.
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The Sin War trilogy isn't set anywhere near the events of the games. It rewinds the clock 3,000 years before the fall of Tristram and follows a farmer named Uldyssian as he gets tangled up in the ancient war between angels and demons over Sanctuary.
All seven of the Great Evils, including Diablo himself, were originally born from the seven heads of a single primordial dragon named Tathamet. Three of those heads became the Prime Evils, and the other four became the so-called Lesser Evils.
Unlike Diablo, Mephisto and Baal, who consider themselves true brothers, the four Lesser Evils split into two separate pairs. Andariel and Duriel call each other twins, while Belial and Azmodan see themselves as siblings, and that lack of unity is a big part of why the Lesser Evils struggled to team up against the Three.
Mephisto, Baal and Diablo styled themselves as a dark ruling triumvirate over the whole of Hell, using brutal strength and cunning to keep the four Lesser Evils in line beneath them. It's this power imbalance that eventually sparked the rebellion known as the Dark Exile.
Outside of the name players know him by, Diablo also goes by al'Diabolos in older Horadric texts, and followers of the Triune sect refer to him as Dialon, the Spirit of Determination. Different cultures in Sanctuary clearly weren't on the same page about what to call the Lord of Terror.
Blizzard spent years insisting 'there is no cow level,' a running joke going back to the original Diablo. For Diablo's 20th anniversary they finally caved, at least in WoW: killing a Treasure Goblin in the Broken Isles could pull you into a farmer's field crawling with axe-wielding cows and a boss called the Cow King, who'd hand out a toy guitar that plays Tristram's theme song.
