This quest is not available in game.
Nalpak in the Wailing Caverns wants 20 Deviate Hides.
As Naralex descended deeper into his nightmare, a strange breed of beasts arose from beneath the Barrens into the Wailing Caverns.
These deviate creatures have strange, otherworldly properties. While evil in nature, it is my opinion that some good can come from their existence here in Kalimdor. I believe their hides will be of particular use in the ways of leatherworking.
If you feel up to the task, venture into the caves below and retrieve some deviate hides.