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 300 for each champion hit by Juggernaut.
Heal for 100 after activating Soul Harvest.
Reduce your damage taken by 10% for 3s after activating Soul Harvest.
Reduce the Cooldown of Juggernaut by 5s after activating Soul Harvest.
Reduce your damage taken by 40% while using Juggernaut.