God of War Ragnarök: Battle with King Hrolf Kraki

King Hrolf Kraki is the leader of the 12 Berserkers you can fight as an optional boss in God of War Ragnarok.
You can find his grave in Midgard, but can only be challenged once you have defeated all of the Berserkers across the 9 Realms. I advise you fight against Valkyrie Queen GNA first in order to get some nice weapons to use against King Hrolf. She’s actually much tougher than him in my opinion!