Valkyries are psychopomps, beings who carry the dead to the afterlife. They are called choosers of the slain, because they select warriors who die in battle to bring to Freya in Folkvangr or to Odin in Valhalla. Freya is the leader of the Valkyries and gets first pick. When the Valkyries are not attending a battle, they are found with Odin and the Einherjar, Odin's chosen warriors, in Valhalla.
The Fireverse Valkyries mostly have war duties. Although any of them might serve someone a drink in Valhalla, it’s not really exclusively Valkyries who do that. Odin has many dead humans for servants, and some of them are dead women who are basically Valkyrie themed waitresses rather than actual Valkyries. The actual Valkyries are unearthly powers.
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