@4zumi
Now I played as Norway, and the Berserkers are not that great of a unit I am afraid to say, I used them in a 1v1 match against Town Militia both units upgraded fully, and the Town Militia one hands down. And knowing Berserkers were around since 100AD and so on and having them continue to fight in 1080AD is like yea, that idea needs an update or phased out completely.
But as I played I thought, why not make two unique melee units for Norway if they convert back to Paganism, and these two I figured would be Knights of Odin basically a re-skinned Danish Obudshaer, that these units wear wolf cloaks like the Berserkers. Another unit I had in mind would be Sons of Thor, a Re-skinned Venetian heavy infantry unit with war hammer and shield but also have winged helmets or horned helms like the Ritterbruder of the Teutonic Order, but that's just me and me throwing ideas out there lol