"Gullinbursti is the boar Freyr rides into battle. He is a gigantic golden boar that can run fast and long. The boar was created by two dwarves known as Brokkr and Eitri. The story goes that after Loki had cut Sif's hair, he needed to make things right again, so he went and got gifts for the gods. These gifts were from the Sons of Ivaldi - whose names or how many of them were are not given. The sons of Ivaldi created a flying ship known as Skíðblaðnir for Freyr, the spear Gungnir for Odin and new hair for Sif. After this ordeal Loki still felt a bit adventorous and went (for reasons unknown to mankind as usual with him) and laid a bet with the dwarves Brokkr and Eitri; that they couldn't outdo the Ivaldi brothers. The bet was on Lokis own head. Thus the dwarves decided to create a boar for Freyr by throwing pig's skin into the furnace and out came a boar that had bristles in it's mane that glowed gold. The boar is said to run through water and air better than any horse ever could and thanks to his mane made out of bristles being so golden that it will never get as dark that it would stop glowing."