Been trying to do the ring of blood for like 30 minutes until hordes came and raided my group, but that wasnt the problem, it was fair and square, now they summoned 20000 murkblood twins and other mobs too and we cant walk without aggroing neither get quests around the area because there are elites spread everywhere.
http://imageshack.com/a/img910/6422/7ojUtw.png