Conquering and developing the ancient Beacons is a task of such enormous scale that it can only be attempted by highly-organized Leagues of Lords. You must join an existing League or found your own if you want to join in the battle.
Beacons can be found scattered across the Imperial Map. Take and hold the Beacons - the sum of their controlled territory will be the sole factor determining your League's position in the League Rankings and influence over the Imperial Map. Beacons may be heavily defended by fearsome units of the Black Horde or rival Leagues, so attempting a successful attack will require careful planning and execution. Upgrading a Beacon increases its Defensive Bonus and its Beacon Range (the amount of surrounding terrain it influences). Once a League has captured a Beacon, its Members must pool their resources towards its development. Every member of the League can contribute resources or sapphires towards the Beacon's next upgrade level. Go to the Embassy and open the "Beacons" tab to manage your League's captured Beacons. You can get updates about your League's Beacons from your Grand Marshal's reports. Your Lord Steward will inform you about Resources deliveries to your Beacon.