I just kited him around his skull, no other battlefield preparation necessary, but a portal around 60-70 meters away. :D

Use a lvl 3 iron banded shield, lvl 3 iron chest and greaves, lvl 3 root mask and you can block anything he throws at you. Was almost boring.

But I like it when people try something else. It shows imaginative thinking, of which I'm severly lacking. ;)