Þursar

Þursar are old stages of evolution. Their daughters take over: Skaði, Gerður and Gunnlöð

Óðsmál finds the 3 þurs-maidens, (–þursameyjar þríar (3 þurs-maidens) are a funny mis-reading of manuscript, so they should not exist.–)
Þursameyjar, daughters of þursar, are more evolved stages than their fathers, the old evolutionary stages.
Clever Óðsmál to see this in context of individual and universal evolution from base states to the highest:  life (–of a living man–) in Valhöll.
Skaði seeks Baldur sun-god, the highest
Gerður finds Freyr, her divinity within, (Edda poem Skírnismál)
Gunnlöð should keep the mead of wisdom from us, but gives it away freely