This isn't really in regards to OP, but just about the recurring topic of Mist Dragon in terms of difficulty.

I've never seen a wipe to Mist Dragon. I've even seen it die more than once before it got to use the Deep Fog mechanic, so there wasn't even any need to dodge the cauterizes. And this is running it multiple times a day on multiple characters so far to cap tomes. I'm not sure what it is about it that is so challenging for people?