From Game Spot:
Assassin’s Creed Valhalla is getting a gigantic update this week that adds a new game mode, introduces more abilities and skills, and makes a very long list of improvements and fixes.
The new mode is called River Raids, and it takes players to previously undiscovered parts of England where they can take part in more raids with loot and rewards to the victors. This is part of the Yule Season event, so it only lasts for a limited time.
Some of the new abilities included with the update are Berserker Trap (releases “hallucinatory powder”), Battle Cry (Eivor gains strength and foes stumble backwards), and Shoulder Bash (Eivor pushes enemies back or destroys objects with her shoulder).