The franchise returns to its dark roots.

Another unsurprising reveal at this year's BlizzCon was the announcement of Diablo IV. The sequel to the colorful action-RPG that is Diablo III promises to tone back the color gamut a wee bit, with hopes of appeasing fans of Diablo II.

As with the other reveals made today, Diablo IV does not yet have a release date. However, we do know that it's in development for the PC, Xbox One, and PlayStation 4. So far we know of three classes:...