The Grave Mistake trophy / achievement in God of War Ragnarok is unlocked when you defeat King Hrólf, the last Berserker Gravestone boss. This is among the toughest fights in the game so you’ll need to be a reasonably high level with upgraded gear and skills. If you need help with this fight you can see our strategy guide for it on the King Hrolf Kraki Berserker King in Midgard page.
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