VALKYRIES - ODIN allowed some of the maidens to take the form of beautiful white swans, but if a VALKYRIE was seen by a human without her swanlike disguise, she would become an ordinary mortal and could never again return to VALHALLA.
In Norse mythology, Odin was the king of the Æsir. He is a god of war and death, as well as a sky god and the god of wisdom and poetry. Along with being a god, he is the All-Father of all the Nordic Gods. He is also heavily associated with magic.
In Norse mythology, a valkyrie is one of a host of female figures who decide who will die in battle. Selecting among half of those who die in battle, the valkyries bring their chosen to the afterlife hall of the slain, Valhalla, ruled over by the god Odin