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 - Basic Attacks against an enemy reduce your target's Physical Protection by 7% for 3 seconds (max. 4 Stacks).
PASSIVE - You gain Physical Power equal to 2% of your Maximum Mana.
PASSIVE - Your first ability cast gains 20% Physical Penetration. This can only occur once every 5 seconds.