Well, it was a really fun campaign! Playing as a migratory tribe and turning into a civilized nation, plus destroying my biggest rival of the whole run Rome was pretty challenging. Initially, I didn't plan on conquering Italy; I just wanted to take a few regions like Cisalpine Gaul and parts of Gaul to weaken them and release them as vassals. However, Rome was playing extremely aggressively, conquering Carthage and Iberia at a scary speed, so I conquered Italy for safety and to help me convert to Christianity later on. After I became civilized, I decided to conquer Greece and Macedonia just to make the borders look cleaner plus having a bigger nation is always nice.
After civilizing, I started playing tall, developing my provinces because I thought it was cool how tough it is to develop an area with all those cold weather debuffs. After that, I just sat back doing financial reforms, intending to convert to Christianity next... but it just never popped up. I don't know if there was a prerequisite I missed for it to trigger or something like that, so it didn't quite go the way I wanted.
Anyway, the campaign was awesome overall, mostly because of how challenging it was thanks to Rome, and of course all the crazy nations popping up like Babylonia, Media, Tartessos, Saxony, Caledonia, Egypt, and so on. 8/10 experience!
(And a tribute to my emperor in the last image for being so important and the most Slavic man among the Slavs.)