As someone who spent at least half an hour with a level 8/9 party attempting to kill him last night with SCS; my answer is "with great difficulty and lots of cheese".
I had no breach or anything to remove his protections, because of the SCS inquisitor nerf keldorn couldn't do anything with dispel, so i basically had to send in skellies to waste some of his spells, then repeatedly run outside when he chucked spells at me. Once his fireshields eventually wore off (multiple times), i just had everyone whack him. Even then it took ages because he had at least 4 stoneskins.
Generally, it's best to do the quests in Athkatla before heading out to the various dungeons. This will usually net you a few +2 weapons and maybe even a +3 or two.
There are a number of enemies ingame that are immune to either normal weapons, +1 or below, +2 or below or +3 or below weapons. It can be useful to pick up items like the +3 axe (stonefire from the Copper Coronet), +4 Staff of Rhynn (Adventurer's mart) or similar to deal with these at low level, before you find a bunch in dungeons.
Comments
Does it have to be the projectiles themselves?
Or if you want to be a little bit more legal..
C:CreateItem("KILLSW01")
I had no breach or anything to remove his protections, because of the SCS inquisitor nerf keldorn couldn't do anything with dispel, so i basically had to send in skellies to waste some of his spells, then repeatedly run outside when he chucked spells at me. Once his fireshields eventually wore off (multiple times), i just had everyone whack him. Even then it took ages because he had at least 4 stoneskins.
How to put it...if you can't kill HIM, you shouldn't be there in the first place :P
There are a number of enemies ingame that are immune to either normal weapons, +1 or below, +2 or below or +3 or below weapons. It can be useful to pick up items like the +3 axe (stonefire from the Copper Coronet), +4 Staff of Rhynn (Adventurer's mart) or similar to deal with these at low level, before you find a bunch in dungeons.
Worst case, Watcher's Keep and grab Foebane, that'll work.