u/ResponsibilityDue138

I've been running guildies through for their TK attunements. This last boss is absolutely smoking my resto druid. I can't tell if he is bad or if the mind flay ability is that awful. I know it does a lot of damage, but how in the world are healers surviving it? I know quick reaction is needed by the heals if a dps gets it, but what is a heals supposed to do if they themselves get targeted?

I've brought hunters before to help on last boss and those runs do go a bit easier, but running so many through I don't always have a hunter avail.