Originally Posted by Riot
Corrosion has to be healed thru as best as possible. Personally I treat Corrosion the same was as a Brutallus stomp - hit my trinkets in order - Pocket Watch on the first, SMI + NS on the second - the Pocket Watch should be up again by the next ground phase - although I think according to the way the fight goes on it may be slightly better to hit the cooldowns in reverse.
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We use a feral tank with a prot warrior OTing to provide sunder, TC, and demo. When Corrosion goes off, prot will intervene the next melee hit to smooth the damage curve out. Feral is nice to provide a larger soak barrier for Felmyst to have to eat through, especially since Felmyst doesn't crush.
As to dispels:
I honestly don't find MD difficult at all (minus the occasional ARGH ARGH ARGH resists). I generally shift to non-casting when the cooldown is up, but I'll refresh dots. The key thing to remember is as long as you don't start a new GCD cast *after* Nova starts to cast, you can MD before it ticks 100% of the time. The cast is 1.5 seconds; the tick is 3 seconds later. MD takes 1.5 seconds.
The macro I use is:
/stopcasting
/cast Mass Dispel
It's a bit harder as holy, since most likely your cursor can't just be hovering in the right location like shadow can (assuming you click-cast), but literally I tag the macro and click instantly and the MD covers my 10, no problem.
As to a group arrangement, let me just say: Triforce.
Two last things, to help eke out a little more damage: you can tag Felmyst with instants in the middle of a bombing run, and since air phase is fairly long, whichever warlock is providing Reck should switch to Doom during air phase, then back to Reck when she lands.