High Quality Content by WIKIPEDIA articles! Horror fiction also Horror fantasy is a philosophy of literature, which is intended to, or has the capacity to frighten its readers, inducing feelings of horror and terror. It creates an eerie atmosphere. Horror can be either supernatural or non-supernatural. The genre has ancient origins which were reformulated in the eighteenth century as Gothic horror, with publication of the Castle of Otranto (1764) by Horace Walpole.