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.
Heal for 25% of the damage Absorbed by Power Siphon.
Heal for 100 for each enemy hit with Shatterfall.
Heal for 300 for each enemy hit by Calamity Blast.
Reduce the damage required to generate a Calamity Blast charge by 300.
Generate 10% of a Calamity Blast charge for each enemy hit with Massacre Axe.
Each Calamity Blast deals an additional 100 damage.