~"daughter of the sea". selkies are mythological creatures found in faroese, icelandic, irish & scottish folklore. they are said to live as seals in the sea but shed their skin to become human on land.
According to Greek mythology, sirens were daughters of the sea-God Phorcys, were born with head and face of woman and had a wonderful and seductive voice, long hair, sitting on a rock. Some legends point to them as seductive daughters of sea gods; others, such as terrible creatures endowed with malignant and supernatural powers.
Tatteredbanners: "In Danish folklore, a helhest is a three-legged horse associated with Hel. The horse figures into a number Danish phrases as recent as the 19th century, such as “he walks like a hel-horse” for a male who “blunders in noisily.” In Schleswig, a phrase is recorded that, in time of plague, “die Hel rides about on a three-legged horse, destroying men.” Jacob Grimm theorizes that the helhest was originally the steed of the goddess Hel." (edited)