Fantasy horror exists where imagination turns against itself—where magic is no longer a source of wonder, but something unstable, corrupting, and deeply unsettling. In these worlds, power comes with consequences, knowledge reveals more than it should, and reality itself begins to shift under pressure. From cursed landscapes to ancient forces lurking beneath the surface, fantasy horror explores what happens when the unknown cannot be controlled. This collection of 70 Fantasy Horror Writing Prompts is designed to help you build dark, immersive worlds shaped by tension, atmosphere, and psychological unease. Whether you are exploring corrupted magic, hidden systems, or the quiet dread of something watching from beyond, these prompts offer a complete toolkit to develop stories that feel rich, cinematic, and haunting long after they end.