I quickly looked but didn't see this mentioned yet:
When he's released from invulnerability, he can be at any point in his AE rotation. He doesn't stop his rotation or suspend it while invulnerable, it's like he keeps casting them even though he can't hit you with them.
This has to potential to cause a hiccup, especially if you've got one person curing based on the names of the AE and the other curing based on just 1st, 2nd, 3rd.
You dont get a message.. it just lands. And it doesnt trigger "massive ae damage" it triggers a small amount of damage...
The massive AE damage occurs when you dont cure the 3rd nox ae in less then 8-10 seconds. Also this will be a delay'd effect, so even if everyone is your raid is cured, it might trigger, due to those people not being cured quick enough. We normally just pot cure the 3rd ae, so everyone is responsible for themselfs, and cant blame their healers, but healers also group cure it. Thats the most importaint thing to do when adds arnt up... cure the 3rd nox asap.
We tried this mob and a lot of people said they didn't get a red message for the curse incoming. Are we missing something?
The 40s timers are not swipeable that I noticed. The trigger from casting with curse on you didn't really do that much dmg to the raid force with over 20k nox resist. The real problem was the interrupt. If it interrupts a group cure on the nasty nox it can spell a wipe very quickly. We were pausing about every 10 sec just to give it a chance to hit people and curing only off MT/OT/healers. Auto atk does not trigger it but I have found that some people simply can't resist the lure of hitting buttons and so we had them back out. I would recommend bringing a nox flag for this fight if some of your people have low resists.
I guess all 3 of his AoE's are unswipeable and on 40 second timers?
The Toxic Inertia triggers on Spells and CA's (autoattack should not trigger it according to the deterimental description) and if triggered will cast a Toxic Bolt AoE that interrupts, stuns for 3s and does 20k poison damage (up to 75% or so mitigated I guess).