Blizzard's action RPG Diablo series is about to turn 20 this coming Dec. 31. In celebrating the event, Diablo will get the "The Darkening of Tristram" event, which enables Diablo fans to re-experience the original game by revisiting the original game's cathedral dungeon, sometime in January 2017.

As stated in Blizzard's blog post, Blizzard will hold a special event called "The Darkening of Tristram" in "Diablo 3: Reaper of Souls," giving players the chance to re-experience the original game by venturing through a re-imagined version of Diablo's cathedral dungeon.

Blizzard first introduced the Darkening of Tristram event at the recent 2016 BlizzCon last November. The limited-availability dungeon crawl, which said to send back players into the depth of the game's original cathedral, will offer a dungeon 16 levels deep in which players will face off against the four Diablos.As reported earlier by Polygon, Blizzard also announced that it will also infuse some Diablo-themed goods in its other games, which include "World of Warcraft," "Overwatch," "Heroes of the Storm," "Hearthstone," and "StarCraft 2."

Here's a tease of what's to expect from Blizzard next month, according to Polygon.

Diablo III: Revisit the original Diablo with "The Darkening of Tristram" event.

Heroes of the Storm: A new Diablo-themed portrait. Hearthstone: A hooded stranger awaits the players, holding a grim deck in his hands.

Overwatch: Bring the battle for Sanctuary into the fight for the future with in-game sprays.

StarCraft II: Put the Lord of Terror to work.

World of Warcraft: Strange things are afoot in the world of Azeroth.

In other Diablo story, the much-awaited "Diablo 4" may be delayed as Blizzard still busy in the current version of the game. "Diablo 3" is still strong and Blizzard doesn't have the plan to release another game.

"Diablo 4" could be in development, but likely won't be announced until the target date is in sight. This strategy has already worked for Overwatch, according to IGN, which was announced and released in the space of 18 months. This approached has also kept players tightly hooked in the game. Tech pundits are speculating that Blizzard might be using the Overwatch-like approach in its sequel development.

Tags Diablo, Diablo 3, Blizzard