Wrap a bat's heart and powdered moth's wings inside a small silk
pouch with an eye inscribed on the exterior. On the back of the
pouch, make a word by which you may call and command the
Wizard Eye. Speak this word when you wish to evoke the Eye,
giving it a drop of your blood for sustenance. The Eye will function
as an aethyric spy under your control until the blood becomes dry.