[andrewas]

If you have an invis potion handy you can avoid a fair few of his earlier spells. or you can simply run up the starirs .anyway, the bugger has two sets of stoneskins to batter your way through.

i used a solo monk and had to resort to hiding in shadows, running up stairs and pure dumb luck to bring down that invisible stalker right after the stun, but i eventualy managed to kill him out in the street.