Mashadar

Mashadar is a malicious, though unintelligent, entity lurking within the depths of Shadar Logoth in the Wheel of Time

Mashadar was formed during the Trolloc Wars from the xenophobic hatred and suspicion exhibited by the citizens of Shadar Logoth (then called Aridhol). Over time, it grew until it consumed the city and its people. At present, it takes the form of a silvery mist that wanders the streets at night and hides in the ground during the day. The scope of Mashadar is unclear; though it is not omnipresent, it is "vast as Shadar Logoth," and is able to manifest itself in many locations at once. The slightest touch of Mashadar is fatal, causing a slow and agonizing death. Though it will attack any entity, Mashadar's choice prey is Shadowspawn, which avoid Shadar Logoth as much as possible after an entire Trolloc army vanished within its walls. Mashadar is a formidable enemy even to a channeller, as it is very nearly impossible to destroy, and will bring its full force to bear on anyone who attacks it with the One Power. It is, however, susceptible to balefire, and will flee when faced by it.