Dawn of Ragnarok will introduce new hooks into the combat already established in the Assassin's Creed Valhalla base game. For example, a new ability allows the player to absorb power and abilities
"Dawn of Ragnarok" DLC takes place after the mythological storyline in the main game and is very loosely connected to it. I almost consider it a side story as well, because other than a few references and a characters mentioned in the mythological storylines, it basically has its own (nonsensical) story.