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.
Heal for 100 after activating Soul Harvest.
Reduce your damage taken by 15% for 3s after activating Soul Harvest.
Heal for 300 for each champion hit by Juggernaut.
Increase your maximum Health by 600.
Increase your Ultimate charge rate by 60%.