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 - For every non-ultimate ability on cooldown you gain a stack of Cruelty. Each stack provides 7 Physical Power and 2% Physical Lifesteal.
PASSIVE - Critical Strike bonus damage dealt is increased by 25%.
PASSIVE - Your first ability cast gains 20% Physical Penetration. This can only occur once every 5 seconds.
PASSIVE - Your abilities heal you for 10% of the damage dealt to targets.