Evil pentagram
Stories of creatures dragged or crawling from the depths of hell. Literally. This is for tales revolving around entities that are not merely "demonic", but actual demons. In these stories, manifestations of evil come not from monsters, or ghosts, or the minds of the insane, put from an underworld of eternal torment and damnation where the unrighteous shall go to meet their just rewards.

Be warned; Due to the nature of these stories, they may bear a degree of religious symbolism.