One of the biggest things that separated Diablo II from Diablo III was some of its classes and characters. A big omission that many fans didn’t appreciate was that the Necromancer was not a part of the game. Then, Blizzard decides to bring the Necromancer back, and not only was that a great joy to fans, but to Game Designer for Blizzard Travis Joy. Who noted in a piece he wrote for Venture Beat:
“I was like: “Hell yeah, let’s do it!” It was a big honor. But it was also a big challenge to bring this character back for a new generation by adding him to what is a completely different game.”
This notion was made reality when some of the things that made the Necromancer special in Diablo II just couldn’t be brought into Diablo III.
“Other parts of the Diablo II Necromancer’s kit simply couldn’t fit into the modern context of Diablo III. Take Iron Golem. That’s a really powerful, compelling fantasy: you sacrifice some legendary weapon or piece of armor, and give its legendary power to your golem. But every time we tried thinking about it we fell into a rabbit hole of different problems.”
He also admits that Blizzard made some mistakes early on with Diablo III, but tried to fix them as time went on:
“I like to think that we can take the lessons we learned from Diablo III’s early development, and how we improved our craft with Reaper of Souls and the Necromancer, and bring them all with us into today’s Diablo.”