25 Jun 2013 25 Jun 2013 01 Jul 2013
He does spawn in Lair of Infinite Agony and it does not matter if you finished the DLC or not. His spawn is totally random.
Sometimes Mr. Wiz does not spawn to do that you need to go to Sanctuary (guess any other zone works aswell) then quit the game. Start it and teleport to Lair of Infinite Agony.
After you look at the video you'll see where you are going, if there is no yello "!" on that spot, simply redo the whole process till it spawns. Amulets costs around 125k $, can be dropped for friends so they can obtain the achievement aswell.