Some tips on the mission:
"Aten Ha Ra points at {C} with one arm, while holding a finger to her lips." - One player has a huge green aura around them. Run from group and only you get silenced. Anyone in aura is silenced after about 10 seconds. In the groups I have been in, everyone runs when the tank gets the aura.
"Dust and blood on the floor around {C}" - This only happens at end, and is similar to the above emote, but the aura is white. Everyone in the aura gets hit with feign death. Hit "Sit" to stand up if you are affected. Person with aura should run away from group.
"Stones form from shadows in the corners of the room." - Golems with purple auras spawn. They march from one side of the room to the other. Avoid standing in edge of room to avoid being jumped by them, and after they show up, look for the gap in their line and run there so that they will march past you.
"Aten Ha Ra shouts. 'Awaken, guardian!'" - Golem spawns in the sky, descends, and then flies back up. To get the achievement "Calm the Stones" an enchanter needs to mezz them. I wait for them to land (not sure if you can mezz before then), and cast mezz. The mechanic is pretty forgiving so even if you are silenced, cast mezz after silence wears off will usually still count. To be honest, there doesn't seem to be any penalty in the group mission (other than the missed achievement) for ignoring them. Maybe that is different in raid version.
