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This entry is part of the Carnal Bestiary, an ongoing collection of descriptions for monsters in a dark fantasy setting. All aspects of this piece and the others of this collection are erotic fantasy and should be treated as such. The author does not condone the act of nonconsensual sex and urges the importance of consent in all sexual acts.
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Regardless of whether there are large bodies of water nearby, tales of mermaids seducing sailors and adventurers alike are well known across the land. First, they lure in the unsuspecting through gentle song, then they appeal to their victims with their alluring appearance, and it all ends as these beautiful creatures drag their prey into the murky depths below. These stories, however, only cover a fraction of the complexity that is the mermaid. While accurate information about mermaids is limited within the general public, a proper understanding of mermaids can save one's life.
Starting with the very foundations of the mermaid, these creatures are actually not monsters in the traditional sense like goblins, kobolds, or the infamous hellhounds. Rather, mermaids are more akin to incorporeal spirits like elementals. Mermaids are in fact physical manifestations of natural energy emanating from ley lines in marine environments. Typically, the creation of mermaids does not occur in unexplored sections of the wilds as discovered by the consistent pattern of mermaid sightings only happening months after human contact within a region.
For centuries, the seemingly cause-and-effect nature of mermaid appearances first led scholars to believe that humans are the natural prey of these creatures and that the presence of humans merely attracts them. Yet, more thorough investigations revealed the abovementioned form of mermaids as manifestations of natural energy, and it was logically concluded that mermaids do not require the consumption of sustenance to survive. This means that mermaids kill only for the sake of killing. The current theory accepted by most scholars and mages is that mermaids are not creatures that live in marine ecosystems, but are creations of the ecosystem itself as a defense mechanism. This theory is largely supported by the positive correlation between the amount of fishing in an area and the number of mermaid attacks in said area. If this is the case, it is possible that mermaids may be an aquatic variation of the spriggans that guard the many forests dotting the land.
While the nature of mermaids may be intimidating to fishermen and sailors in particular, the methods mermaids employ in killing people is frightening to all. As mentioned in the many stories about mermaids, these creatures do utilize singing to lure humans toward them. However, it is not their beautiful choruses that entrap their victims as certain epics have recounted. The mermaid instead prevents their prey from leaving by targeting the unfortunate person's other senses.
To further lure in a person once sighted, a mermaid begins to produce pheromones that drastically increase the sexual drive of their victim to unbearable levels while simultaneously limiting their ability to perform critical thinking. Some records even note that men affected by these powerful pheromones have ejaculated without any physical stimulation upon inhaling the mermaid's sweet aroma. As these pheromones increase their prey's libido, the primal energy emitted by the person's arousal is then read, for lack of better terminology, by the mermaid allowing them an understanding of the person's unique sexual desires and tastes.
Mermaids at this point then transform the upper-half, the human part of them, to meet the personal preferences of their victim. Breast size and shape, hair color and length, body curvature, muscularity, facial features, and even apparent age; all are molded like clay in a matter of seconds to create the victim's ideal lover. If the target's preference is men, then the mermaid's upper-half will take on masculine features and appear to change sex. However, it should be noted that as manifestations of environmental energy, mermaids do not have genders. It is only due to the higher ratio of men preferring women for sexual mates within fishing and sailing communities that these monsters commonly take on feminine looks and have subsequently been termed as "mermaids".