As a subrule of Rule 2.2 (Inventions), add a new Rule called “Rivet Gun”:-

Cost: 6 Iron, 2 Quicksilver, 3 Cogs     Power Requirement: 5
An Invention with a Rivet Gun is considered to be a Weapon.

In the rule “Regalia Actions”, replace “This action costs 2 Iron, 1 Cog and 1 Coal to perform.” with:-

This Action requires the Commoner performing it to own a Weapon Invention, and costs that Invention’s Power Requirement in Coal to perform.

As a subrule of Rule 2.2 (Inventions), add a new Rule called “Motion Sensor”:-

Cost: 5 Iron, 2 Cogs, 1 Gem     Power Requirement: 5
This glinting red mechanical eye has no intrinsic effect.

In the rule “Regalia Actions”, replace “By paying 5 Iron and 2 Cogs, a Commoner may build a Sentry Tower in the County they currently occupy.” with:-

If a Commoner owns an Invention with a Motion Sensor, they may remove that Invention from the Inventions wiki page and raise their income by the Invention’s Power Requirement, to build a Sentry Tower in the County they currently occupy.

As a subrule of Rule 2.2 (Inventions), add a new Rule called “Drone Unit”:-

Cost: 5 Iron, 3 Wood, 2 Quicksilver, 2 Cogs     Power Requirement: 10
If a Commoner owns an Invention with a Drone Unit, any Regalia Actions performed by that Commoner may be performed as if the Commoner were located in a neighbouring County to the one that they currently occupy.

Remove the “Use an Air Drone” bullet point from the “Regalia Actions” rule.