How to spawn Diablo Clone!

The real story on that screenshot, is that some people were playing around with the 1.10 Beta patch, and stumbled across the stats of "Uber Diablo" while playing with the .mpq's. Rumors flew around and people didn't know what he was supposed to look like, or if he was supposed to spawn like a "Champion" or "Unique" kind of Diablo. Some people modded the patch to include Uber Diablo with a band of Diablo minions (much like a unique monster spawns with minions, and those minions are tougher than normal monsters, giving you the "Champion" Diablos).

That is in Normal, and was a screenshot of the modded Beta.