Quickener or Mage Storm
A Quickener is another byproduct of bad magic. Hopefully only seen as a small "cloud" of writhing magical energy, these storms have been known to grow to city-sized during the last God War. Quickeners are mindless, wandering around aimlessly absorbing any magic they come into contact with and then casting it back out randomly. The more magic it finds, the larger it gets and the more it can cast.