Correct me if the name of this meter is wrong; I am referring to the curved one at the edge of your health bar, that has the number 0, 1, or 2, depending on how full it is.
I know that this generally just goes up through the course of play, and it goes up quickly enough that casual players don't really need to think about how exactly they're building the meter. However, depending on how the meter builds, this could make strategies focused around that, like strategies focused around breaking armor in Soul Calibur IV.
What actions build up your meter, and how much do they build it up? Do some attacks build it up more than others?