Hit a 74k HP, 6900 Ac monk for a bit less - max at 13k, average between 8 and 10k. Straight forward fight. Be sure to clear ALL spiders wandering near by, before you pull the named. The spiders will kill you if they enter the fight when you are not expecting...we wipped once because of this.
There are 3 solo grendlaens on that side of the valley, all within range of each other. Any of those 3 can be his PH, becasue i''ve puleld him from all 3 different locations. I've never seen him spawn as part of those "Wad of 3 grendlaen family" that are also in the same location. If you have a good puller, you can keep the PH for the named spider and these 3 down, no problem. Except, someone might see him pop while you're killing one or the other. Quite common in Valley to have people snipe named you've spent 2 hours trying to spawn.