The demon in the series could be considered frightening. He has a head of a goat and a human like body. Lots of devil worships and sacrifices. Hilda cuts Zelda's neck or Zelda cuts Hilda's neck.
There's a lot of VERY SCARY or sadistic scenes. But there's also a lot of humor. Most of it's dark humor though
Many scary entities or scenes. A young girl is chased by a demonic scarecrow, a weird goblin creature hides behind furniture before exposing itself as a cat, many satanic or unholy references, evil spirits or demons,
A flashback scene takes place when a little boy gets lost in a mine during a game of hide and seek. He then sees a demon in the cave surrounded by a red light as if it's crawling it's way out of hell. The way it's shown is unnerving.
One episode is based on a possessed man. Throughout the episode he makes many disturbing appearances. Sometimes he jumps out of nowhere or physically attacks. His physical appearance could also be disturbing. He has yellowish eyes and speaks in a taunting unnatural way. Definitely scary and disturbing.
Witches bully a witch in sadistic ways
A sacrifice scene in one episode involves a girl bound and gagged by Sabrina, when Sabrina and her friends sacrifice her with a look of fear in the girl's eyes, and Sabrina behaving evilly, blaming the girl for the fate she has to cope with.
The ending can be very emotional