In the digital display, the mistake/typo on page 4, the example Grim roll uses a d4, "Grim Light" in the list, "Grim Dawn" in the example.
Likewise, in the next example (combat vs zombie), the example states Grim Twilight, but the zombie throws a d8, which is Grim Dusk in the list.
What makes the most sense to me is the following list:
- Grim Dawn: d4
- Grim Twilight: d6
- Grim Dusk: d8
- Grim Dark: d10