Frigid Fate and Storm Swell are bugged! Actual testing on Lillith, not dummies 

Frigid Fate is acting as a 1.3x multiplier to your additive cold Damage.
TLDR if you have 300% cold damage, the game thinks you have 390%
This is bad. A normal maxed out build will only see around an 8% increase in damage, not the 30% we expect.
Storm swell I can't quite figure out, but it's extremely low. My data showed an 11.5% increase, not a 30%. I would assume its some form of small additive vulnerable damage around 30 to 50%, not a 1.3x GLOBAL Multi as stated.
Instead of going from 10,000 to 13,000 damage, you will probably see a 5% increase in damage in a real end game scenario, not on a stripped down character.
I did actual testing on a real end game boss, and am linking all the data.
I used about half of what I recorded and stopped after hitting around 100-125 data points
Blizzard. Please do something about this. We are struggling.
Data Link - Updated it was private
docs.google.co...
Testing Video - • 5.28.24 Frigid Fate an...