Temperance is Qi's card: Qi of The Water Song, the trilogy that accompanies the Karnese tarot. This one has only the most tenuous link to Karn, but it's still a part of the story.
The card is about the reconciliation of impossible opposites. A paradox at first glance, but with enough complexity of understanding it's possible to tease out the subtle distinctions and nuances that allow it to exist. It's about working with the forces that hold polar opposites apart, about balancing them and through that balance, like positive and negative numbers that can keep increasing as long as they are equal, tapping into quantities that would otherwise be too great to manage.