Does anyone knows ?

I’m wondering if anyone knows how the perks really works. What I mean is how the value shown as a add up to your Blizzard let’s say works. On my belt is shown 5200 and I really doubt that is real. With a 8000+ Blizzard I would have take out in one strike lots of skulls. Which is not the case. Not even 1.So any clues ? OH not to mention that on my crown I also have it as perk but the value is much less, about 3000+

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