In the subule “Stockpile”, remove the sentence beginning with “There is a Defense Factor” and remove the “Defense Factor” column in the table contained in that subrule.

In the rule “Castles”, add a subrule to that rule named “Structures” with the following text:

Each Vassal has Structures, which is a list of zero or more of the following Structures in the table below, and in which there may be multiple of the same Structure, defaulting to an empty list.

Each Structure has a Cost, which is a list of one or more Materials, a Theatre (which may be one or more of Air, Land or Sea), and one or more Defensive Values, each of which is a number that applies to that respective Theatre in the order in which it is listed. If a Theatre isn’t listed, the Structure’s Defensive Value for that Theatre is 0.

{| class="wikitable"
|-
! Structure !! Cost !! Theatre !! Defensive Value
|-
| Wooden Wall || Wood || Land || 10
|-
| Moat || Wood || Land, Sea || 25, 10
|-
| Stone Wall || Stone || Land || 50
|-
| Stone Tower || Stone || Land, Air || 20, 10
|}