Grendel

 is a gargantuan stingray-like creature that resides within Geffenia. It seems to hunt birds as prey and has the ability to levitate.

Trivia

 * Grendel is one of three antagonists (along with Grendel's mother and the dragon) in the Anglo-Saxon epic poem Beowulf (AD 700–1000). Grendel is usually depicted as a monster or a giant, although this is the subject of scholarly debate.