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 - You gain additional Magical Power and Lifesteal scaled from missing Health. This caps at 70 power and 10% Lifesteal at 40% Health.
PASSIVE - Melee Basic Attacks decreases enemy Physical protections by 7, and increase your physical protection by 5 for 3s (max. 2 Stacks).
PASSIVE - Basic Attacks against an enemy reduce your target's Physical Protection by 7% for 3 seconds (max. 4 Stacks).