Novels in the low fantasy subgenre of fantasy. The sub-genre concerns magical events which intrude on an otherwise normal world, i.e. real world. Intrusion fantasy places relatively less emphasis on typical elements associated with fantasy, setting a narrative in realistic environments with elements of the fantastical. Sometimes there are just enough fantastical elements to make ambiguous the boundary between what is real and what is purely psychological or supernatural. The word "low" refers to the level of prominence of traditional fantasy elements within the work, and is not any sort of remark on the work's quality.