Game:

Diablo III (2012)

Duration: 5:52

1,322 views

1

This is Blizzard's special in-game event during January 2017 celebrating Diablo franchise's 20th anniversary!
http://us.battle.net/d3/en/blog/20409444/celebrating-20-years-of-diablo-12-31-2016

For those who are wondering the quality of the video in the dungeon, this is working as intended by Blizz to bring back the feelings of the original Diablo 1!

The Red Soul Shard is dropped by the special event Diablo (not the normal Diablo in act 4). See here: https://www.youtube.com/watch?v=F3vG9RYKoj4

Unlike other legendary gem, it can only be inserted in the helm slot. Doing also gives you a special transmog. (Obviously a reference to the Diablo 1 ending that the hero plunged the soulstone into his own head.) Its AoE damage is decent but on a long timer. Also, every time it procs, the player character is stunned briefly.

Also, it does NOT work with Leroic's Crown.

Other Statistics