Fantasy is Also Horror I: Magic is Existentially Terrifying

We can sort fantasy realms into two general systems: one in which our real-world understanding of physics usually applies and therefore magic breaks those understandings and/or the fundamental laws of physics themselves; or another in which the fundamental laws of physics and the universe differ from our own enough to justify the existence and use of fantasy-world magic. While the former usually tends to be the more grotesque and horrific of the two, the latter retains the same basic source of fear: constant paranoiac uncertainty.