Welcome to Grim’s lair
The only text written about the Author Grim is in ancient books. It is written that his father was a notorious dwarfen warrior and his mother a Viking Shieldmaiden descended from the gods. It is also written that Grim was born on the battlefield when his mother (who was heavily pregnant at the time) slew the mighty dragon Oulah, and as the dragon took his last breath, Grim took his first.
However, it has also been written that Grim wrote the ancient books in the first place!