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 8 seconds after using an ability, your next basic attack will deal an additional 10% damage. The effect can only occur every 3 seconds.
PASSIVE - Protects you from a single hard Crowd Control effect once every 70 seconds. When this occurs, you gain 1s of Crowd Control immunity.