Do you know Morgen ?
"
Morgens, Morgans or Mari-Morgans are Welsh and Breton water sprites that drown men. They may lure men to their death by their own sylphic beauty, or with glimpses of underwater gardens with buildings of gold or crystal. They are also blamed for heavy flooding that destroys crops or villages. In the story of the drowning of Ys, a city in Brittany, the king's daughter, Dahut, is the cause, and she becomes a sea morgen.

The morgens are eternally young, and like sirens they sit in the water and comb their hair seductively.[1] In many ways they are a female version of the Scandinavian nixie. In Arthurian legend the "Lady of the Lake" is named "Morgen".[2] The origin of Morgan le Fay may lie in these Breton myths.[3] "

~ wiki

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