Has anyone done any testing to see how charisma and circle affect the number of charges the sword has? I did a test with my character, and it surprised me the amount of use I got out of the sword. Circle is 73, charisma is 40. The levels are followed by the number of swings I got before dropping to the next level. I'll give it a try the next couple circles, and next couple of charisma points, unless anyone else already has a formula to figure out how it's all calculated.
emanating 19
shining with holy power 150
faintly glowing with holy power 150
barely glowing with holy power 150
flickering slightly with holy power 40
flickering faintly with holy power 10
DRPrime - Celeres Turrance