Instead of my usual holiday forays up north into the wild, I spent the long, dark evenings absorbed by the world of Assassin’s Creed: Valhalla. In it, you play a Viking invader in ninth-century ...

Do you have to have watched the History Channel’s “Vikings” series in order to fully appreciate “Vikings: Valhalla“? For this newcomer, at least, the answer is…well, yes and no. The ...