People keep pulling numbers out of their ass about how CoS/CoE were nerfed 13,75%, 18,75%, 15%, 20% or whatever other random number they can think of.
The old CoS added 18,75% on average. No, not 15%. Not 20%. 18,75%. That's how the math works, you see.
The new CoS adds 5% on a 0 resistance target. We'll assume these still exist and that some people have trouble beating them.
That's 118,75% total damage with old CoS, 105% with new.
The difference, ladies and gentlemen:
(1-(105/118,75))*100% = 11,5789%
An 11,6% nerf on targets with 0 resistance.
Now, let's find the magical border at which the old and the new version are equally good.
We know that the old version is 118,75% total damage. The new version is x%*1.05 total damage.
x*1.05=118,75 <=> 113,095
This means they're equally good when the new version reduces target resistance by 13,096%. Simple math reveals how much resistance is required to reduce by that amount: (Assuming level 60)
13,096 * 4 = 52,384
To sum up:
On targets with 0 resistances, it's an 11,6% reduction in damage.
On targets with 52,384 (or 52) resistance, it's a tie.
On targets with 75 resistances, it's a 5% boost.
On targets with any resistance, using Binary spells (Frostbolt and Blastwave for example), it's a 5% boost.
Thanks for no longer using arbitrary numbers!
Source: http://forums-en.wow-europe.com/thread. ... 122334&P=1
