Look, I get it. You want to toss out an interesting and challenging fight. The problem here is that he is nigh unkillable unless you bring a crapton of DPS and some of us simply cannot do it, at least not solo, which is how I play. It really sucks to get to the end of a three segment Expedition that was going rather well and then have to face this guy. You get him down to maybe 70% and then his minions heal him right back up. If you try to kill them, he just keeps respawning them... endlessly.

At least make it a fair fight by putting a cap on the number of times he will summon them, say four adds total. That way, we get challenged a bit, but we have a fighting chance to not waste 90 MINUTES OF OUR TIME trying to bump our level cap up by three while also trying to loot, sort loot, keep what's good, toss what's bad, and vend it all at the end of each segment.

A good guide would be Diablo 3, where you can get in and out in 10-15 minutes and feel like you've made an iota of progress. You don't have to set aside an entire evening to bump to the next tier because of failing the first, very long attempt. Now I have to invest another 90 minutes and HOPE I don't get him again in any of the three segments.

Please work on tuning this down a bit. It's not fun and fun is why I play.