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Resists for CoD are applied at spell cast. If it hits, it's doing damage in a minute unless it's knocked off by another debuff (still a possibility, even with 40 slots). CoD is good for fights like Curator because when well timed, it's a fire-and-forget meganuke. CoA can do more damage when you have sufficient spell damage (was attainable in MC at 60, unsure what it is with new ranks), but keep in mind you're casting it 2.5 times per minute, rather than once.
Lastly, with exception of a few encounters, it's almost universal that CoS, CotE, and CoR will do more damage raid-wide than CoA or CoD, with less cast time, and less mana. Topping the damage meters can be fun, but it's the mark of a great player to sacrifice 2% of his damage to add much more to the raid as a whole.
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