Marmennilin (The Merman of Elduvík)
A farmer named Arnfinn from Elduvík encountered a Marmennil—a merman who lives at the bottom of the sea, smaller than a human with long fingers, who delights in teasing fishermen by stealing bait and snagging hooks. One day, the merman tried to stick Arnfinn's hook to the seabed but accidentally hooked his own hand and was pulled into the boat. The fishermen made the sign of the cross and brought him home. For years, they took Marmennilin fishing; when fish were below, he would laugh and play, and the men always caught plenty. But one day in rough waves, the men forgot to make the sign of the