A slipgizzle is the owl word for a spy, or an infiltrator. Usually rogue smiths are asked to be slipgizzles for the Great Tree. In the book, when an owl comes to a rogue smith, they become chatty when they are getting their new battle claws or other metal items, so it is a good job for the smith because the owl might say their plans. Some are recruited for different reasons. A few examples of slipgizzles are:
- The Rogue Smith of Silverveil
- Gwyndor
- Hortense/Mist
- Pure One infiltrators in St. Aggies:
- The dying Barred Owl that Soren's band found
- Kylor
- Ginger
- Half Beak and Three Talons
- Rodmilla Plonk