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from spark dps calculator

because i didn't get how it's +-6 billion damage.

My thoughts on calculating the value of dps:
Spark proj hit from one cast has cd 0.66 sec.
we have 9.4 casts per second. Let's take 9.
i am very dumb in math so actual damage will be more.
9/0.66 = 13.63. let's take 13
161,745,984*13=2.1 billion dps.

So how it is x4 damage? Does calculator wrong? Or i'm just dumb
pob https://pobb.in/Lipuk3Z1-AdQ