Grellfeens are giant frost-like serpents originating from the northern icey salt waters of the Freljord, specifically the Ice Sea area near the Ursine Lands.
They have a row sword sharp teeth used for ripping of flesh. Like the frost serpents, they have a thick sharp hide that enables them to survive low temperatures. Unlike their relatives, the grellfeen can grow to an enormous size, being able to rap its entire limbless body around a Freljordian ship. They have large bloodshot eyes and front nostrils.
The Ursine usually hunt these animals for sport and food, although some tribes have also been seen hunting them when times are desperate. Their meat can be carved into large chunks and transported by boat to the coast.