Fully buffed with Tenacity etc. There would be no way. You simply could not tap fast enough. Matter of fact I would say this guy is not tap tankable by any necro right now /shrug. For any that say you can post a vid. At 75 with 10k hpts and a decent bit of defensive completed he ate me for lunch.
i just soloed him (75 necro) had tenacity though. I am at 8.8k with tenacity, but they key thing i used to beat him was my pets, my infusion of the faithful, and 2 dots that hit for over 1k.
tap tanked him last night at 74 with 9k hps and pots... just snared/dropped dots like mad fd stand tap tap fd tap dot fd tap dot fd and repeat - need only to hug the wall near the columns on west side of room to avoid agro... hug it tight. close fight but nonetheless but can be done... put pet on other side of him and let pet push towards wall... easiest way with group is just have tank stand just outside his spawn spot and push towards wall... anything else and ul wipe for sure without mezzes :)