Travel to the Hinterlands, and locate the Wildkin. Kill 10, and use the Muisek Vessel to shrink and capture the fallen Wildkin. Bring 10 Wildkin Muiseks and the Muisek Vessel to Witch Doctor Uzer'i in Feralas.
This will be a test; both of the ritual I performed, and of your abilities. Take this vessel, [player]. With it, you will have the power to shrink and capture a creature inside of it.
Travel to the Hinterlands and look for creatures known as Wildkin that were once pets of the night elf goddess Elune. The vicious, primitive, or savage owlbeasts are your targets, [player]. Kill 10, and use the muisek vessel to shrink and capture them before their spirits can escape.