Mob is pure melee. Facing the 3 in this spawn point, you can usually pull outside mobs single, leaving the ph or Piklo by himself. Dirt soldier usually the mob on the right, and caster on the left. Got the arms about 3x out of 10 kills. I usually 2 box 65 SK/Shaman, and adds are not a problem. Sick doggie and Sk pet on one, and SK tanks the other. Easy camp, and safe spot just inside alcove.
There is one roamer that goes by ocassionally. This guy can be a caster, and will gate, if not interrupted/killed. If he gates and you're solo, you need to do the same, because they're bringing friends. If you're in far enough inside the alcove, he'll walk by you with out aggroing. This guy and Bone Trooper are a good 2 spawn camp, with Trooper in next cave to the left. You will get adds in Bone Trooper alcove.