Development Update: Diplomacy, alliances that actually mean something

Greetings, emperors!

New development blog post is up! This one takes a look at diplomacy, specifically two mechanics that quietly shape how alliances actually behave: Join Wars and Return Cities.

I cover how the AI decides whether to join an ally's war, weighing relation value against how many enemies are involved, and why a diplomatic AI will actually hand back cities founded by its allies over time, unless it's an aggressive or hardcore personality that never lets go. There's also a recap of the diplomacy system as a whole, and a hint at a bigger diplomatic addition planned for after launch.

Read the full post here: https://www.imperium-aeternum.com/2026/09/03/when-your-allies-go-to-war-so-do-you/

If you haven't wishlisted Imperium Sine Fine yet, it really helps as I head towards launch. Thank you!

Cheers!