Diablo 3 players Kripp and Krippi have achieved the world first hardcore Diablo kill. These two players were playing Diablo 3 in a mode that means once you die, you lose your character and all the items it was wearing and you have to start all over again. Inferno mode is the hardest difficulty in the game, and Diablo is the final boss in the game. Basically, they were the first people to beat it.
And what did they get for their accomplishment? A crappy blue ring that will be worth millions of gold (or hundreds of dollars on the RMAH) for what it represents. Here's a video of the final moments before the kill.
What's makes the achievement even more special is that Kripp and Krippi were under a time crunch to get it done. Mere hours after they killed Diablo, Blizzard patched Diablo 3 and made game-changing decisions that nerfed several classes. They also made Inferno difficulty a bit easier so more people would have a chance to play through it. Defeating Diablo pre-nerf like Kripp and Krippi did will be something every BlizzCon goer will remember forever. Congrats!