The story of Diablo 1, Diablo 2, and Diablo 3 doesn't fully explain all the lore of Diablo. In episode 3 of this Diablo lore series, we look at who the Prime Evils were: Diablo, Mephisto - the father of Lilith - and Baal. We discuss their discovery of Sanctuary and their plan to create the Triune and star the Sin War. Could any of this lore be relevant to Diablo 4? Could Diablo 4 be a prequel?

Sources: http://diablo.wikia.com
https://diablo.gamepedia.com/

More Diablo 3 Reaper of Souls guides, builds for all classes - Demon Hunter, Witch Doctor, Crusader, Barbarian, Monk, Necromancer, and Wizard:    • Diablo 3: Reaper of Souls Guides  

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Executive producers: Kiskaloo, MohEternal, NickTick, Recramorcen, 2hoste, Sarge9017

Special thanks: Maia Nashira, Toioiz, Remiehneppo, Neme5i5, Matthew Feiteira, Toioiz, Joel Williams, MONGAS INC., Terry Lee, Valentine Judnich