Arch Goblin Golem

Has anyone that has fought this nm give me an idea of how strong he is/diffacult to defete/ect.?

noone? :(

Our LS routinely kills every arch boss in every zone. Farmed this particular one several times.
Can easily be done with 10-12 people. What you need though, is your DD's to /nin. It does a seismic stomp (not sure of the actual name of the move) that shadows can absorb. It's the deadliest move that this NM does. What will wipe you is it can do it multiple times, back to back. When we did it a few level caps back, we had a pld hold it, and DD's just go in WS, run back out. They TP'd off of the repops near and kept the support clear from aggroing them as well.

Drop rate sucks on the knife btw, best to bring a thf. Most DD's don't appreciate /nin and may want to insist coming otherwise. they'll get off 1 WS and be useless the rest of the fight. Good luck.