On this page of our guide for Assassin's Creed Valhalla you will find a description of the battle against boss character named Rued. You will find out when you'll confront Rued, what attacks the boss has at his disposal and how to avoid them, as well as how to defeat him efficiently and quickly.
The boss fight against Rued takes place while completing the story mission A Fury from the Sea. During the raid on Burgh Castle, you'll find out that Rued is alive. On top of that, he holds Oswald, who was considered dead, prisoner.
Rued, as befits a true Viking raider, will not fight fair. He has his loyal wolf to help him, which should be eliminated in the first place. The animal may cause you some trouble during the battle with the main opponent.
The fight with Rued is very similar to the battle with Leofrith. Rued wields a two-handed sword - his attacks are slow and telegraphed (yellow flash), but they can remove a good chunk of Eivor's health if they land. Rued's move set includes classic cuts, upward cuts, as well as overhead and broad horizontal cuts.
In addition to the standard, damaging abilities, Rued can also activate health regen. As soon as he kneels down and is surrounded by a white aura, attack immediately to break the spell, otherwise the opponent can regain full health.
Rued also has one ranged attack and will try to hit you with a flaming weapon. However, these attacks can be easily avoided or blocked.
During the battle, Rued will additionally set his two-handed sword on fire to inflict increased damage. Three hits with the flaming sword will set Eivor on fire and inflict fire damage over time. Avoid your opponent's attacks and do not let him regenerate and you should be able to deal with him quickly.