Blizzard will release a remake of the original Diablo - created inside of Diablo III, the company announced this weekend at BlizzCon.
Entitled The Darkening of Tristram, in reference to the original ARPG's setting, the anniversary patch will contain all 16 levels from the original Diablo, as well as the four principal bosses.
It will include a "Glorious Retrovision" graphics filter, which downgrades the game's visuals into a pixelated, '90s-inspired look, reduces frame rates, and limits character movement to eight directions.
The Darkening of Tristram will be a limited-time retrospective event, and will take place annually in January.
Diablo 3 will also see a separate, paid character pack, bringing the Necromancer character class to the game, in 2017.
The game's first expansion, Reaper of Souls, will receive two new zones as part of a free update next year.
Players interested in trying The Darkening of Tristram can test a pre-release version next week on the Diablo 3 public test server.