(Are we still calling it Elysium? I don't think the name fits any more)

And in order to capture Workers you'd have to go to Monolith itself, so while you're there you may as well grab Providence. As a key point of interest, it is good. As an entire nation, it lacks in that it is limited to a single city in a single location. But then again, it isn't as if we have much room. In terms of politics, Monolith would likely be on good terms with the central nation, for who else is there to trade manufactured goods with? This also means you could deprive the central nation of many manufactured goods by cutting that supply line.

I'll play the central nation.

So, we have so far:
Immortal dream-control king in Central nation
Volcano shadow shamans and Caldor cult
Loner jungle lizard riders
Golem-run manufacturing city

Geographically, so far we need jungle, volcanoes, and desert, and probably kinder terrain to chuck the capital in. We'd probably have some mountains too. Considering size, it would be impractical to have a tundra, although if we need cold we can chuck them on top of the mountains. Volcanoes would probably go somewhere at one end of the mountain range.
Then again, we could probably get away without much desert, at least not within the borders. Monolith would be wedged somewhere in the mountains. Those mountains probably form one of the borders. On the other side could be desert.