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 - Your Basic Attacks deal +25 True Damage and your Abilities deal +35% Damage versus Jungle Monsters. When you kill a Jungle Monster you are restored for 10% of the Monster's Health and 25 Mana. Can be upgraded at level 20.