In the rule “Castles”, add a subrule named “Reputation” with the following text:

Each Vassal has a number named Reputation which defaults to 0 and can be at most 5.

In the rule “Waves” add the following step just before the last step in the atomic action:

* If the Vassal’s Damage increased as a result of the preceding step, subtract 1 from the Vassal’s Reputation, to a minimum of 0. Otherwise, add 1 to the Vassal’s Reputation, to a maximum of 5.

In the rule “Fortnight”, add the following step just before the last step in the Fortnight atomic action:

* For each Vassal, add a number of Serfs equal to that Vassal’s Reputation.