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.
Increase the Healing Spirit Links provides every 1s to your linked friendly target by 100 Health.
Increase your maximum Health by 150.
Linking to a new target reduces all your Cooldowns by 0.1s.
Heal for 80 every 1s while Spirit Linked to an ally.
Heal for 100 when you use Envelop.
Increase the range of Chain Heal bounces by 40%.