Great Modron March

The Great Modron March is an event that happens every 289 years, and it's a massive inconvenience to anyone involved. Every 289 years, the Avatar of Primus sends out a massive army of modrons on a reconnaissance mission, to march across the continent and return to Mechanus to report their findings. The journey is long and arduous, and most modrons do not return.

Route
As modrons are obsessed with order, they always follow a set route across the continent, and this route is well-known among historians and prominent figures. Some towns, planning ahead, have constructed a large road for the modrons to cross over, to attempt to have the whole army pass by without causing too much (ironically) chaos. The route is as follows: There are multiple locations and cities that the modrons do not pass through, as information that those places exist has never reached the Avatar of Primus. The modrons are not aware these places exist.
 * Mechanus
 * Alpha
 * Beta
 * Grave Hill
 * Wargrun
 * Greenfront
 * The Beach
 * Firbolg Village
 * Lonely Lake
 * Fiz'e-at-Sea
 * Drunkridge
 * Valley of Gods
 * Heatdra
 * Valrion
 * The Living Gate
 * Big Croak
 * Okrel
 * Oasis
 * Forever Storm
 * Thunder Jungles
 * Mechanus