I've seen them crit with lower def, think it was 450ish.
Its double damage just like any melee attack would be.
Just the fact that they deal magic damage does not mean it is considered a spell in WoW world. Two years ago Ragnaros crushed newb rogues with fire dmg to death. Its just the same thing like it was physical damage.
But i guess resist comes before crit in calculation here. So a 75% resist crit wouldn't matter at all. The problem is, its kinda hard to rely on those resists, when you have to wear resi against two spellschools.
So a decent def is still a must imho.
I kinda like the idea to tank all 4 of them, would make things much smoother. But don't think i could obtain enough of the two resistances to do this, and still have enough spelldamage to actually tank them, not just trying to tank them

. Guess we'll just stick to the 3 addtank strategy, why change a running system. But i'll try to get those resistances up to 200ish unbuffed, hope it won't be so sluggy that way.
Let me know when you managed to solo them ^^
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