Uylak in Turkic mythology, (Azerbaijanese: Uylax) is a male or female witch or spirit.
They are thought to be people connected to the Devil, and are capable of harming other human beings by sending illnesses, killing cattle, spoiling a harvest, etc... The word was also used as an insult. An Uylak can turn into any animal or any object. He is capable of shapeshifting into a horse, a moth, or a wolf. He is also resistant to Archura's enchantments.
It stops the people on desolate roads and infested with them.
The term Uylak comes from Turkish verb Uylamak (means to insist, to urge, to pester) and Oyalamak (to delay). The term Uylak can be translated as "diversionary" in English.
References
Uylak Wikipedia(Text) CC BY-SA