Hey, thanks!
The Charging Aspect adds linearly.
(I was hoping the first Dancer's charging would let the second Dancer attack 4 times, the third 8 times, and so on, but that would be too broken lol)
As far as I remember:
The first Dancer had 2 mirrors, 1 Charging
The second Dancer had 1 mirror, 2 Charging (The second Charging didn't stack)
After mirroring, I had 5 Dancers, each with a Charging aspect, which added 10 more attacks to the Duelist making it 11 in total.
The 11 attacks in turn raised the Duelist's stats exponentially.
PS: I saw your recent comment, does the Charging Aspect actually stack exponentially now? Haven't played this in a month)