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 - Basic Attacks against an enemy reduce your target's Physical Protection by 7% for 3 seconds (max. 4 Stacks).
PASSIVE - When critically striking an enemy, gain a stack of 5 Physical Power, max 3 stacks, for 5s.