Freyja transformed Óttar into the boar Hildisvíni through seiðr, disguising him so she could ride to the giantess Hyndla and demand his genealogy without revealing his mortal identity.
Hildisvíni is Freya's battle boar, which she rides to the cave of Hyndla in the Hyndluljóð. The boar is actually Freya's protégé Óttar, whom she has disguised to learn his ancestry.
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