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 - Your Critical Hits provide you with 10% Physical Penetration for 4s.
PASSIVE - For 8 seconds after using an ability, your next basic attack will deal an additional 10% damage. The effect can only occur every 3 seconds.