|Appears in:||To Be A King, The Coming of Hoole|
Penryk suggests to Lord Arrin that they can use Ullryck to kill Pleek and Ygryk after they find Hoole. She is useful since she has no motherly instincts and Penryk comments that her ancestors came from the deepest smee hole. Ullryck isn't seen, but she is said to have two good fighters and they fly after Pleek and Ygryk.
She isn't mentioned only to the fact that she attacked them but both Pleek and Ygryk were rescued by Kreeth. It's unknown if her companions were lost or not.
There were rumors that Ullryck had left Lord Arrin and started a whole division of just hagsfiends.