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.
Each Soul Fragment gathered Heals you for 75.
Increase your maximum Health by 150.
Reduce the Cooldown of Juggernaut by 3s after activating Soul Harvest.
Heal for 300 for each champion hit by Juggernaut.
Reduce your damage taken by 20% for 3s after activating Soul Harvest.
Increase your Ultimate charge rate by 60%.