During a trip to visit the prophetic giantess Hyndla, the pious man (*)
According to Wikipedia, this creature was depicted on the helmet of the mythical Swedish king Ali, also called Onela, and after Ali's defeat in battle that helmet was used by the mythical Swedish king Adlis, who is mentioned in Beowulf as having a helmet with the kind of animal that this creature is. During a trip to visit the prophetic giantess Hyndla, the pious man (*) Ottar is disguised as this creature. This creature's owner also owns a magic falcon- feather cloak and Brisingamen, a necklace. This creature is sometimes used in place of a chariot pulled by gib-cats. For ten points, name this boar belonging to the Norse Goddess Freya.
According to Wikipedia, this creature was depicted on the helmet of the mythical Swedish king Ali, also called Onela, and after Ali's defeat in battle that helmet was used by the mythical Swedish king Adlis, who is mentioned in Beowulf as having a helmet with the kind of animal that this creature is.
{Hildisvini}  [editor’s note: Wikipedia’s claim that King Ali had hilisvini on his helmet is based on the fact that in Skaldic poetry, his helmet is said to have a “battle-swine” on it. Hilisvini, of course, means “battle-swine”. I checked this in non-Wikipedia sources]