Everblight

Abrashine and Ghyshish. Eventually connected by a locomotive line - but before that, the two settlements were seperated a winding 'plains' that made communication foolhardy, but tension inevitable.

Now Abrashine was firmly a member of the Hsithborn Demonarchy, with a massive winged imp as its leader - some sort of mutated Samoth imp whose name is lost to time. Meanwhile Ghyshish was run by a coalition of Iron Demons - something the Lust Demons currently dominating the bloodlines of the Demonarchy were loathe to have become a stable identity.

So the demonarchy encouraged their representative to make headways into Ghyshish lands, openly supporting Abrashine aggression, but often found missing when the fighting made return fire. While the people of both settlements grew to resent this false support, the peoples could not do anything to soothe the pride of their leadership, nor could there be much communication between the settlements, for those who tried to cross the plains between were removed from the cosmic equation - 'taken by the iron winds' if you were.

The war threatened to consume both settlements in an eternal war that only would fuel Hsithborn supremacy when both regions fell and fell into ruin - but there was a development that stopped that idea in its tracks. The demons of Abrashine developed the Everblight - a pathogen that they infected their combatants with, that caused the ability for light telepathy between those infected. When the surviving Hsithborn agents returned to Ghyshish walls, the Everblight spread, jumping from demon to demon until someone who could listen became its host. The reader might think that this would be the leader of Ghyshish, or even a charismatic Lust demon who might gain Hsith support in a coup.

It was not. It was a simple Iron demon smith, who, when showing the leader of the city weapons ready for inspection, heard the voices of Abrashine, and decided enough was enough. Apologising to the stubborn, but manipulated great-imp, the smith slit the imp's throat, as those infected with the Everblight took over the city. While the Everblight ran its course, Abrashine and Ghyshish were forever joined after that, the locomotive line a natural progression of the linking of the two towns.