Well, it’s the highest barring someone doing it in a plane… The feat was performed at the base camp below Mt. Everest, at 5050m elevation, by a reader of Diablo3.cc. Thanks to Secondii for pointing us to the news post which includes a video of the base camp, footage of Mt. Everest in the background, and the Diablo III action.
Playing Diablo III from Mt. Everest is a lot like playing it on launch day — the hard part is maintaining a connection to Battle.net (as well as dodging Yeti attacks) — but it’s a cool achievement all the same.