Originally Posted by Akston
Wouldn't 1/21/49 be the way to go for fire destro with a point in Imp Corr to help with molten core uptime. Even at 80 or even 60% have immo fall off would be extremely rare especially with any amount of haste.
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Probably not. Corruption ticks 6 times, meaning you'll have 6 10% chances to increase fire damage by 10% for 6 seconds. That's very roughly 50% chance to get a proc per Corruption. So that's a minimum of three seconds spent casting Corruption for 6 seconds of 10% extra damage. So long as three seconds of casting Incinerate is at least 6% more damage than Corruption it's not a worthwhile investment.
Assuming no other buffs but DSing an Imp and CoE (w/o Malediction), at 1k spell damage Incinerate will hit for ~1.75k damage. Corruption will do ~1.8k damage. However, with an 20% crit rate Incinerate's damage averages ~2.5k. That's well more than 6% more, and that's for only 2.25 seconds of cast time.
You'll also be reducing the extra crit bonus by 2% per point spent on Corruption. It's just not worth it as it stands.