Raudkembingur

Raudkembingur is a sea-monster from Icelandic folklore and one of the Illhveli ("Evil Whales") which acted as major antagonists in many stories across the region.

Role in Folklore
Raudkembingur (“red comb” or “red crest”) is the most savage and bloodthirsty of all the Illhveli and is unmatched in ferocity and determination to harm boats - like all other Illhveli the Raudkembingur is treated as an abomination and consumption of its meat was strictly outlawed.

The Raudkembingur has no limit to the evil or malice it can unleash and thus out of all the Illhveli this monster is considered the worst and fishermen would actively avoids areas it was known to frequent, it could play dead for half a month in order to try and lure victims close, at which point it would leap onto their boat, destroy it and drown all on board - due to its love of destruction the best means to defeat the beast was to play into its sadistic nature, for example on a particularly violent rampage the monster managed to destroy eighteen boats in the course of one day and was about to do the same to the nineteenth when it was tricked by the crew dressing a piece of wood in clothes and tossing it overboard, believing it to be a human the monster continually tried to drown it while the boat made its escape. Due to its malevolent nature Raudkembingur may ally with evil witches or sorcerers, or be a form they take to cause chaos - a trait it shares with the Hrosshvalur.

Abilities
Raudkembingur is extremely large and strong, capable of sinking boats and swallowing humans alive - it is much smarter than a normal whale as it delights in sadistic ways to trap and destroy anything it comes across and while it relies mostly on cunning it has access to ill-defined dark magic, since it can ally with witches and sorcerers, as well as cause bad weather and other minor phenomena associated with evil spirits of the ocean.