Mana usage modifiers.

I seem to use a varying amount of mp per lightning rod. Here's a few trials:

• 51
• 49
• 50
• 51
• 51
• 50
• 51
• 51
• 52

So I think small variations in lag cause different results. In general, it costs about 51 mp per lightning rod. My intelligence during testing was 1288, and I have rank 1 lightning mastery. What's weird is that with the -20% cost from mastery, it should cost 48 mp. I believe that the tiny amount of lag that is inherent in any online game, no matter how lagless you are, causes the extra 1~4 mp cost.

EDIT: Oh, and to answer your question about minimum mp cost. I also appear to require 46 mp. I think I actually managed to fire it just before my mp actually hit 46, so maybe it requires something like 45.6 mp to use.

Part of what bugs me is that my mp usage has not changed since I ranked up lightning mastery. And it isn't affected by the universal -30% cost from my staff, but is still using significantly less than what we have listed.