I was lucky enough to find a bud to test a variation of this build and it melted everything on our path but do get in touch with me if you wanna have some fun togetha. IGN: Kryth Vocans
It's a bunch of shockwaves one after another with added aoe. You can add as many elementalists as you want btw, the build is the same for every player. Maybe 8 elementalists can even raid some dungeons with this (+a hard res like eternal aura) :p
I'll make a gameplay vid of this asap!