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Throughout the series, mages have a tendency to go mad with power. Villain Zultan Kulle is a good example Diablo 4 Gold, as is the Sorcerer class from the first Diablo, who appears in 2 as an enemy. What would the Wizard be like years after the events of Diablo 3, having attained the unimaginable power she was seeking?
3 Imperius
Current leader of the Angiris Council, and considered one of the greatest warriors in the Diablo universe. His role in Diablo 3 tends to be hostile, and he was about to attack the player before being interrupted by Diablo. He requests the players' aid later, but offers no gratitude .
Altogether, Imperius is an unpleasant angel, so it's unfortunate he never appeared as a boss encounter; a battle against "the greatest warrior in all of creation" would make a good fight. Hopefully players will get their shot at him in Diablo 4.
2 Zultan Kulle
The dark Horadrim, a more sinister version of Deckard Cain. He appears in Act 2 of Diablo 3 as an evil wizard requiring resurrection to allow the player access to his archive, and the Black Soulstone buy Diablo IV Gold.
The Wall