groups 1/2/3 - one MA groups 4/5/6 - two MA groups 7/8/9 - third MA
So three MA's have each MA grab a mob and those groups DPS it. When more pop off tank and just keep cycling thru mobs.
Sony has coded this event so chanter mezz is worthless. At first you can mezz mobs but when the yellow murderers start spawning all mezzes will break and all mobs will become unmezzable. Therefore don't try and mezz the adds, just DPS them.
If you do not touch an add it will despawn the event. So you have to pick up all of them.
2 dots during the events, 1 big 1 little. These are corruption dots 1 druid can cure a whole group, while 1 cleric can cure about 3 people in a group with 1 pallidan curing 3 people. Try and set up groups accordingly.
2 Big parts of this event. DPS and cure. Just keep curing and keep DPSing. RC9 will cure too, but it's not always up.
At the end a named mob will spawn, this kill this 1 mob and the event is over, all adds will depop. So when the named pops Kill him get all your DPS on him.