yeah, sorry for that, my Test conjuror killed it pretty fast and I had no problems with the adds, except the weird regen that seemed to trigger when I was hitting them. I was told that the bubbles spawning later explode and that you need to be at range to avoid damage when they do.
On the "clearing the zone" part, you don't really need to clean everything. I did it to catch all the anchor locs, but you mostly need to clear the entrance and main plaza and you'll be fine.