In Norse mythology, saying something out loud was to give it form, meaning, and power. That's why fate is called a 'wyrd'. The Wyrd of Stromgard is exactly what it says it is- the power to shape heroic tales amidst chaos, violence, and magic.
The Wyrd of Stromgard is an expansion to Dungeon World that comes with everything you need to run highly detailed Norse fantasy and Viking campaigns like:
7 Compendium Classes
Robust setting that's easy to customize
Monster Manual with over 20 monsters, all on their own spread and with narrative examples
Ready-made Adventure Front