I feel it's a combination of most RTS games like Civilization, Starcraft, Stronghold, and those mobile RTS games that are forever persistent and you can be attacked offline there are A LOT of them but they don't have a victory condition besides events that give out HUGE boons for completing.
I...
I think the "Vanished Empire" would have worked too, Alt would have been "The Lost Empire" as I think it's implied that it didn't just fall it just up and disappeared/vanished.
Don't know if it's been said but for people who don't know a "hiatus" for these things is just them making more chapters as a buffer so when they release them and they have to take a break or get slow on the production they can keep releasing them without stopping unless the artist is injured or...