This is our proprietary skill rating calculation. This has nothing to do with official game ranking or MMR.
The purpose is to show player skill levels relative to other players, not estimate MMR.
PASSIVE - Critical Strike bonus damage dealt is increased by 25%.
PASSIVE - Your Critical Hits provide you with 10% Physical Penetration for 4s.
PASSIVE - Critical hits on enemy gods afflict them with poison for 2s. This poison slows them by 10% and reduces their damage output by 15%.