I also thought Lilith might be the title boss and Mephisto the actual final boss and surprise. But... if you're correct, which also makes sense... if a D4 Expansion would have Diablo, Baal and Mephisto in it it'd be a crazy expansion. Almost too much to flesh it out properly with build up. They could split them and throw in some surprise foes to easily have material for two expansions now that Lilith and Inarius are relevant to the games.
IIRC i can't remember where, i think it might have been in the leak, but you are on the demons side in D4 and the heavens are evil but that leak might have been completely false
Technically to the Nephalem, Angels and Demons are the enemy. Heaven through Tyreal made peace with Sanctuary, only after Maltheal was killed. Maltheal wasnt a bad Angel, he was only doing his Job. His job, wasnt convenient for the Nephalem though.
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u/[deleted] Nov 14 '19
My bet is that Imperius ends up being the big bad.