Hey guys, I just entered Pindelskin's lair for the first time in Hell mode after rescuring Anya, and lo and behold, Diablo was there! I almost S**t myself! I have never seen this before...has anyone else experienced this?!
Yeppers. Happens when people on the server sell a certain number of the unique ring "Stone of Jordan". He'll spawn at the first super unique you encounter. He drops a really nice, unique small charm.