50 hits in 7 seconds... + Iron maiden = death

I would classify volcano as a DoT and make it immune to iron maiden. Even if your careful they can cast iron maiden after volcano is out and its a bad time.

Edit: On that same note, I'd do the same with hurricane. Probably skills from other classes that aren't coming to mind.

Great suggestions. I reworked these Druid skills a bit (mo betta) and made them DoTs as you suggested. Makes sense to me.