Brooke felt profound recognition as he observed the procedure. She remembered Gunnar using these same needles to save her. These needles were not made from standard silver but from the leaves of a plant called Glacial Silver Cypress. Hence, they were also known as Glacial Silver Needles.

Glacial Silver Cypress grew in places where it snowed all year. Moreover, it only produced needles once a decade. The needles needed for acupuncture required leaves from a hundred-year-old Glacial Silver Cypres