DLC - Babylonian Civilization
This is the highly powerful science turtle civ, apart from that other one
Babylon focuses on science generation, as evidenced by its unique abilities:
* Receive free Great Scientist when you discover Writing
* Earn Great Scientists 50% faster
Babylon's science focus is geared towards having an early science advantage, which players must leverage going into the late game. These bonuses are more technical than Korea's (Korea being that other science civ) since you must earn and manage their Great Scientists efficiently - but that earlier science advantage can help you out, because science counts for a lot
in Civilization. Just make sure you use your first free Great Scientist to build an Academy and you're off to a good start.
Their unique unit and unique building are both available in the Ancient era, and both help defend fabled Babylon from aggressors. The Bowmen can be used to go on the offensive if you really need to - with less units than if you relied on Warriors/Archers - and the Walls of Babylon have utility throughout the entire game.
Babylon's aesthetic is pretty great, and for me it's a close (very
close) winner over Korea's. Their AI behavior, or I should say Nebuchadnezzar II's, is usually kind of crazy. He's ornery and will likely build tall, although in my experience he can do this with a lot of cities in a small space as opposed to picking the Tradition policies and building a handful. Attacking him can prove a headache with his uniques and his tech advantage. Nebuchadnezzar II was historically mentally ill for a duration of his reign, which goes a way towards explaining the leader scenes.
I'd recommend this for players who want to, in the words of one r/civ user, 's**t science and S**T Great Scientists'. You only get Babylon with this purchase, though - wait for a sale to get better value.
Just don't spawn next to Assyria. That can be painful.