Wouldn't even have known what this thread was really talking about until last night. I joined a group of folks trying to take down Grandfather. We tried him twice: both times we were doing pretty well, and got him down to about 40-45% health. All of the sudden a huge blast and... everyone within melee range is dead. No one understood what was happening, but it makes sense to me now. Sad thing was were were really working together on heals, dots, etc. to make it happen and I thought for sure we had it. Oh well, I guess we weren't fast enough.