Loosely inspired by the Nøkken - a shapeshifting water spirit from Nordic mythology said to lure victims with a siren's call and a stringed instrument - the entity in Mad Island is reimagined through a lens of alien intrusion and psychological disintegration. Rather than a mythic trickster, this version is more abstract and ancient - a force of memory, grief, and perception that defies easy explanation. The result is something spectral and unknowable, both grounded in folklore and untethered from it.
It reveals itself through a haunting blue liquid - a bioluminescent substance that infects memory, amplifies ambient sound, and carries the voices of the lost like ghostly feedback. This substance functions as a living echo, warping time and perception, and becomes a recurring symbol throughout the film. Its presence deepens the sense of dread, linking the natural world to something far older, colder, and more sentient than it first appears.
The entity’s visual identity was crafted by designer Maciek Sokalski, whose glacial, alien-inspired aesthetic brought eerie specificity to its form. Drawing on elements of ice, decay, and deep-sea creatures, Sokalski developed a design language that feels both organic and extraterrestrial. His practical concept work laid the foundation for the final appearance, which was enhanced through restrained post-production and subtle VFX - allowing the creature to emerge not with spectacle, but with eerie intimacy.