Dagon

A morphine-addicted officer aboard a captured cargo ship survives and recounts an encounter with a monstrous entity he calls Dagon — a vast, fish-like Great Old One that emerges from the sea near a remote island. The creature's indifference to its victims is as terrifying as its malice; it does not even notice the fishermen it slaughter before them. Lovecraft's foundational Cthulhu Mythos tale blends cosmic horror with visceral body horror and a haunting, hallucinatory atmosphere.