Dark Objects

: "Of the Horcrux, wickedest of magical inventions, we shall not speak nor give direction —"
: — The introduction of Magick Moste Evile[src]
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Some items could be bewitched with Dark Magic for various purposes. They then became known as Dark Magic Artefacts (or simply Dark items). The following items were associated with Dark Magic:
Object 	Notes
Bewitched books 	Books could be bewitched with dark charms to cause harm to anyone who attempted to read them. Examples included Sonnets of a Sorcerer, which caused the reader to forever speak in limericks, an unnamed book that a person could never stop reading it, as well as one that would burn the reader's eyes out. Tom Riddle's Diary was both a bewitched book and a Horcrux.
Hand of Glory 	A severed human hand with a candle placed within it. It provided light only to the holder, and was commonly attributed to catching thieves and plunderers. It was also able to penetrate Peruvian Instant Darkness Powder and Light-creation spells.
Horcrux 	An object (or living being) that contained a fragment of a Dark wizard's divided soul. It was used to provide protection against death, thus providing immortality, and was considered to be the darkest of all objects.
Opal Necklace 	A cursed item which turned up in Borgin and Burkes, was apparently purchased by Draco Malfoy, and almost killed Katie Bell. It was cursed very heavily, to the extent that merely touching it caused nearly instant death. It had killed at least nineteen Muggles.
Objects in the Black house	Various objects belonging to the House of Black could be classified as Dark, such as an enchanted music box that would put people to sleep, ancient purple robes that would strangle those who get close, a Grandfather clock that would shoot heavy bolts at passers-by, spider-like tweezers that would puncture somebody's skin, a silver snuffbox that would bite an individual, and a highly dangerous locket Horcrux that contained Voldemort's mutilated soul.
Black Quill 	An enchanted quill that did not require ink, as it wrote with the blood of the person using it. What the user wrote would be carved onto the back of his or her hand, and the blood from the words sliced into the hand would be magically siphoned and used as ink on the parchment. It was used as a torture device.