Some Artifacts Of Doom are dangerous because they are evilly sentient and want to subvert you to their ends. Others are dangerous because they are keys to open a portal to some place of big bad nastiness, whether it be Hell or whatever place Eldritch Abominations come from, or because they have the power to summon the big bad nastiness into this world. This trope is about these kinds of artifacts. Many Tomes Of Eldritch Lore are also artifacts of this kind, unleashing any number of nasty things upon the world when some poor Genre Blind fool makes the mistake of reading the book in question aloud. Other artifacts might require some other means of activation, especially if they're being used as the linchpin of some Big Bad's Evil Plan. While this is primarily a Horror Trope, examples that aren't malevolent can also be included here. See also Artifact of Doom, Hellgate, and Summoning Ritual. If the artifact in question is intended to summon a specific friend, as opposed to some deific supernatural entity, that's Just Whistle.
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Anime and Manga
- The Behelits from Berserk, which act as a key to the Astral Realm where the Godhand live, and are activated when their bearers cross the Despair Event Horizon. Normal Behelits are used by humans to become Apostles, while the Crimson Behelit, which appears once every 216 years, is used by its bearer to become a new member of the Godhand during the Great Eclipse, and in both cases, a sacrifice is required.
- The Necronomicon Ex Mortis (not to be confused with the Necronomicon associated with the Cthulhu Mythos), which was accidentally used by Ash from the Evil Dead series to summon some big bad nastiness from Hell which proceeds to mess up his life in ugly fashion.
- The apartment building in Ghostbusters, which acted as a gateway to the realm of Gozer the Gozerian.
- The Lemarchand's Boxes from Clive Barker's horror stories, the most famous one being the Lament Configuration from the Hellraiser series, which acts as a key to the realm of the Cenobites when somebody solves it.
- William Hope Hodgson's Carnacki the Ghost-Finder stories. In "Gateway of the Monster", the title being (a giant strangling hand) enters our world through the Luck Ring of the Andersons - a small pentagonal ring. It was originally activated by being worn, but continued to summon the monster afterward.
- The Shining Trapezohedron in HP Lovecraft's Haunter in the Dark summons the titular Haunter, an avatar of Nyarlathotep (it also gives you visions on the Outer Void and of its own history, but summoning an Eldritch Abomination is clearly its main function).
- Robert Asprin's Thieves' World, Poul Anderson's short story "The Gate of the Flying Knives". The title gate is a large parchment 8 feet long and 4 feet wide. Through it, sikkintairs (dragon-like monsters controlled by the Ilsig gods) can be summoned to carry off or kill people.
- Michael Moorcock's Swords Trilogy. Corum Jhaelen Irsei has a hand cut off and one eye put out. He is given two artifacts to replace his lost body parts, the Hand of Kwll and the Eye of Rhynn. With the Eye he can see into an other-dimensional cave, and with the Hand he can beckon the inhabitants of the cave to come to him and fight his enemies. Anyone killed by the summoned creatures replaces them in the cave for the next summoning.
- Thoth-Amon's Ring of Set from the first Conan the Barbarian story, "The Phoenix on the Sword," which the sorcerer used to call down an Eldritch Abomination to destroy his tormentor and everyone with him.
- The Mortal Instruments can be used once every thousand years to summon the Angel Raziel and request a favor from him. In theory the summoner could compel him to grant the request, but this is very unwise thing to try given that he is a powerful archangel.
- In Fancy Apartments, the Big Bad is summoned using a demon's horn... By accident. And the summoning gets messed up mid-way, so the Big Bad spends most of the story trying to fully materialize.
- Destroy The Godmodder had the black monolith, which started the Homestuck Invasion.
- The "Grimoire for Summoning the Zoologically Dubious" from Homestuck.
- The strange program that summons Lord English definitely also counts as one of these.
Anime and Manga
- The Dragon Balls can be used to summon the Eternal Dragon, who will grant one wish.
- Possibly derived from Lohengrin (see Theatre, below) (as C. S. Lewis was a big Wagner fan (though it may come from Astolfo's horn in Orlando Furioso — or both), Queen Susan's horn in Prince Caspian is blown to summon aid to the army of the Old Narnians.
- In Dragon Bones, magic-bound slave Oreg can be summoned using the ring to which he's bound. The problem is that his magic is limited and he can't teleport away again.
- The Wheel of Time has the Horn of Valere, an artifact which summons the great Heroes of the Ages to come and fight for the one who blew the Horn.
- But they aren't necessarily good. They're tied to fight for whoever blows the horn, not for good. So it's sort of borderline... However, the last book reveals that, contrary to what popular in-universe opinion says, the Heroes will fight for any mortal who blows the Horn. They will not, under any circumstances, fight for the Shadow.
Live Action TV
- The first and subsequent editions of Dungeons & Dragons had the Horns of Valhalla, that could summon heroes from Asgard to fight for the possessor. Of course, if you didn't meet the requirements of being able to use them, the summoned berserkers would turn on you.
- A Ring of Djinni Calling does just that—it summons a genie to serve its wearer for an hour per day. Based on the story of Aladdin, of course, though unlike the Genie of the Ring in that story, the genie isn't inside the ring, it's actually summoned from another plane of existence.
- In Lohengrin, the eponymous Swan Knight, forced to leave his wife, gives her a horn to give to her brother if she ever sees him again, promising that the horn will bring aid in danger (presumably when blown).
- There are three Summoning Artifacts in Tales of Monkey Island Chapter 2: The Siege of Spinner Cay, all of which can be combined into one Summoning Ball Artifact used to summon the Sea Creatures to help Guybrush find the alleged resting place of La Esponja Grande. And it's no wonder that McGillicutty and his crew want the artifacts so they can stay with being Poxed that way once they destroy the magical voodoo sponge.
- The Hex Gate Disk in Edict Zero Fis is a borderline case; the holder can summon and control creatures using the device. Whether this is good or bad depends on the holder of the artifact.