i've searched online and no one is entirely sure (i.e during a certain quest or difficulty) but i just can't get it to spawn!
for those that don't know development hell is a secret dungeon that spawns in the cemetery of the forsaken in act 1 where all the enemies are named after people who worked on D3 and the guy at the end is jay Wilson a purple mob and grants a feat of strength for killing
I'm on nightmare and have killed leoric and constantly gone on and off for an hour and a half now trying to get it to appear but no luck
is there something I'm missing???
But it does exist, and eventually you will find it.
and most important, never try to find this staff that doesnt exist.
I didn't realise it was a special place, before i saw the text under their names :p couldn't find Chris metzen tho. Could he have been the Champion mob standing outside the entrance? didn't look at his name, as i was busy keeping myself alive :/