There are several adventures and expeditions your empire can undergo in Crusader Kings 3 to spread their fame. A unique one that Norse empires can do is called Varangian Adventures. These were added alongside the Northern Lords flavor pack. These allow your empire to expand their borders far beyond where they previously, overtaking enemy empires that are a further distance away. These adventures allow your empire to amass a large number of forces and conquer a distant empire. It’s important to note you cannot use this tactic against other cultures that can also use the Varangian Adventure, so you won’t be able to do this against any nearby Norse empires.
You can only undergo a Varangian Adventure if you are a Norse empire, and your ruler must be a Baron or a Duke. If you meet these requirements, you should be fine to try this out.
To start a Varangian Adventure, it’s similar to starting a war against another empire. But the reason for this is to take your entire province of people from one location of the world to another. For example, if you’re tired of the cold north, you can always choose to battle against one of the many empires in England, taking them out of the location and then carving your home there. You’ll be battling against several new adversaries, but it gives you an option to be a new starting location and access to new resources.
Any vassal you previously had in your old land will become independent. You’ll be able to interact with them as if they were any of the other empires, but since you’re in a new land, you’re better off dealing with your allies and foes. You don’t have to worry too much about having a small force, either. A large fighting force is given to you when you undergo this tactic, and you can assault the new land with enough armies to topple it.
The Varangian Adventure does cost 1,000 prestige. While it is a powerful way to move to a new location, it’s costly, but it does pay off in the end.