Nicor

The beautiful Nix or Nixie who allures the young fisher or hunter to seek her embraces in the wave which brings his death, the Neck who seizes upon and drowns the maidens who sport upon his banks, the river-spirit who still yearly in some parts of Germany demands tribute of human life, are all forms of the ancient Nicor[.]

And the conquest of the ogres comes at the right moment: not in earliest youth, though the nicors are referred in Beowulf's geogoðfeore as a presage of the kind of hero we have to deal with[.]

“I also had the good luck to kill nine sea prowlers, or nicors.”