Kagato said:Its a pain in the ass, spent way to much time looking and suiciding for it, in the end I followed the advice above and started from the top north laval edge and worked way down and there he was, however im sure I have checked that same spot many times before, he was about 2/3rds of the way down.
Incidently he conned purple and was very difficult to kill, I wouldn't try soloing it unless your buffed or he spawns lower level for you.