Create a rule called “Inventions” with the following:

Each Commoner owns 0 or more Inventions, tracked on the wiki page [[Inventions]] (updating that page should only be done to take an action, to revert a mistaken update, or to change it to match the actual gamestate, as with the GNDT); each Commoner starts with 0 Inventions. An Invention has one or more Properties, listed in subrules of this rule; a Property has a Cost, which is any amount of Resources, a Power Requirement, which is a number, and an Effect, which applies to all Inventors who own an Invention with that Property. No Invention may have more than one of the same Property, but two Inventions may share Properties. An Invention itself also has a Power Requirement, equal to the total Power Requirements of its Properties, plus the square of the number of Properties it has, plus five times the number of different Resources involved in its Cost.

A Commoner can create an Invention, with a set of existing Properties of his choice, in their own possession by spending its Cost, spending its Power Requirement in Coal, and reducing his income by its Power Requirement; after doing so, he must edit the [[Inventions]] wiki page to specify the Invention and that he owns it; this is known as Inventing. A Commoner cannot Invent if he owns 3 Inventions already, however, nor if any of the Resource spending would be impossible or illegal due to leaving his Resources holdings at illegal values.