Boo-urns...they lied about inferno

[Vash]

My guess is that you pay 6 points to start the spell up and then the amount in the formula for each attack or segment of the inferno.

Hmm...I've tried lightly clicking on my mouse button to try to create the shortest (time-wise) possible burst of flame. I noticed that my mana orb went down by only like 1 or so (instead of 6). Granted I have a couple of points in warmth, but I'm only level 8 or so.