The Peace Counter is a variable that keeps track of the effect of a Peace Treaty. During each turn, the Peace Counter was supposed to be reduced by one, until it reaches zero. However, this actually happens twice per turn, and one of them does not check for reaching zero properly, so it is possible for the counter to turn negative, it is unknown whether this causes any side effects or not. As long as the Peace Counter is not zero, the AI wizard cannot - Break Treaty or Declare War through the Need for War checks towards that wizard.