Diablo officially turns 20 (damn, we’re old) on December 31.  Blizzard isn’t going to let it pass quietly, planning in game events for all their properties to celebrate the milestone in style.

Announced earlier this year at BlizzCon, Diablo 3 is getting The Darkening of Tristram which places the original game inside the sequel.  Relive the grainy, gritty, old school graphics and sounds as you attempt to take down the 4 original bosses.  At first, this is all that was announced, leaving many fans scratching their heads.  Surely an anniversary such as this should have something more.  More is exactly what it will have.

Announced through the official blog, all Blizzard games are getting in on the anniversary fun.  Some games will only get a few cosmetic items, others look to get full blown in game events.  Unfortunately, there aren’t many details yet, just teasers for things to come.

Diablo III:
Recapture the feeling of your first play through of the original Diablo with The Darkening of Tristram tribute event. Venture through a reimagined version of the original cathedral in Diablo III and keep an eye out for some familiar items.

Heroes of the Storm:
The battle for the High Heavens continues, and a new Diablo-themed portrait is up for grabs! Can you emerge victorious on this hectic new brawl map?

In this Tavern Brawl, a hooded stranger awaits, holding a grim deck in his hands. Will you unravel the secrets surrounding this dark wanderer?

Bring the battle for Sanctuary into the fight for the future with in-game sprays representing your favorite Diablo III classes—along with a new player icon modeled after the Lord of Terror!

StarCraft II:
Put the Lord of Terror to work for you with a Diablo-themed worker portrait.

World of Warcraft:
Strange things are afoot in the world of Azeroth as denizens of Sanctuary cross over into an unfamiliar world.

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