Originally Posted by Esoth
Well serpent sting seems to follow this formula: (2*1.045-1)*1.15+1
In other words, it's using 50% of mortal shots but 150% of the meta gem. I have no idea why it's doing this - the formula they use is probably different but this one at least matches my results.
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Continuing to poke at this due to a lack of something better to do:
The fact that they're only taking 50% of mortal shots would be easy to understand if they just did 2 changes to their forumula without making them work together - for example they originally had SS with a 50% crit bonus, and with 3.2.2 they made that bonus benefit from mortal shots. Then they hotfixed yesterday to add another 50% crit bonus, but didn't make mortal shots apply to that extra 50%. Using that formula I can match my and your results exactly because obviously it works out to the "50% of mortal shots" bonus your got earlier.
MetaBonus = 0.03
MortalShots = 0.3
MortalShotsBonus = (OldBonus+OldBonus*MortalShots+NewBonus) = 1.15
I've been trying to come up with an explanation for why this kind of slip would lead to 150% of the meta gem bonus, and it seems like a similar (but in this case beneficial) issue, the old and new bonus portions of the base modifier get the meta applied separately:
They're calculating the net bonus as:
MortalShotsBonus*(1+(1+OldBonus)*MetaBonus+(1+NewBonus)*MetaBonus) = 1.2535
giving us the crit modifier of 225.35% observed.
Basically since OldBonus and NewBonus are each 0.5, and we're adding each separately to the base damage before applying the meta, it looks like the meta gets applied 1.5 times.