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 - When critically striking an enemy, gain a stack of 5 Physical Power, max 3 stacks, for 5s.
PASSIVE - While you are under 25% of your Maximum Mana, gain 20 MP5
PASSIVE - Getting an assist on an enemy god or minion kill grants 2 Protections for 5s, max 5 stacks