I guild did that to me yesterday and it made me laugh a lot.
We had our nice little smite build team (i'm happy every time i lose cause i see a counter to it lol, counters exist but since it takes 3 times longer to join a non-smite group than to join a smite one, i'll keep non-smite for guild play!) and we saw a team of 7 necros rushing at us.
Basically here is what i saw:
6 necros come in with a Death Nova on. They all come straight in our face, use BiP x 3 on a 7th necro and used Chillblain to die and blow up, not all at the exact same time cause i saw a few Putrid in there (i know the 7th necro used putrid and maybe 2 more necs). Chillblains blewup our enchants so forget protection for at least most of your team. An 8th player that i never even saw had put up an EoE and just stayed far from it i guess. EoE was at 16 Beast damage, so it must be a ranger but it doesn't really matter.
So the 6 necro blew up and with that damage + EoE it seriously beat up our team (half dead, the other half grasping for health. They triggered on our casters mostly, they couldn't get all of them but we didn't have a lot of monks left don't know clearly cause all went so fast). The 7th N/Mo used Light of Dwayna. Tadaaaa, all the necros were back up and used Dark Pact + Vamp Gaze on the few remaining battered up party members we had. Killed them pretty damn fast. The whole fight lasted less than 10 seconds, so i didn't get a good idea on the skill set they had out of Death Nova, Putrid, Chillblain, Dark Pact, Vamp Gaze, and the N/Mo Light of Dwayna (i think others had rez sig cause Dwayna missed a necro but it was raised fast, maybe more than one carried Dwayna in case, dunno). Not sure either how the N/Mo survived at more than half hp through EoE, maybe he had Demonic Flesh and Symbiosis was up, not sure (Symbiosis wouldn't have helped us much cause they all Chillblained)
I tried that for fun with other people after but... we never got past ghost! The blow up + EoE doesn't work there cause they're not affected by EoE. We tried a couple of time and never managed (but the people i was with sucked, so it doesn't mean much). Anyone has an idea of how you pass ghosts with this kind of build? Have enough people carrying fiends and Restore Life and use a mass fiends build to punch through? Find a way to mix Nova and Putrid that could work?
If anyone knows how this build works exactly, i'd like to hear it, if anything it's a good way to gain faction fast cause your fights are extremely short and you have sure kills. And they seemed to win a lot from what the people were saying in Tombs district.