Asmodean Crystal

"This imp has a business he runs. He needs to access the mortal realm to carry out his work. I know your demons are some of the only ones who can traverse freely and legally. I was wondering if you could assist me in... finding a way he could, too?"

- Stolas to Asmodeus, about giving Blitzo a Crystal

Asmodean Crystals are a type of magical mineral that allow hellborns to access the human world.

They are mostly given to Succubi by Asmodeus himself for the demons to conduct Earth-related business and are usually disguised as part of everyday jewelry.

History
Asmodean Crystals are first referenced in "The Circus" during the song Stolas Sings, wherein Stolas procures a book from his personal bookshelf titled "King of Lust - Asmodeus" and skims through pages detailing Asmodean Crystals. The pages are written in runic alphabet which, when translated, reveal that Asmodean Crystals are mainly given and registered to Succubi (and Incubi) by Asmodeus himself, allowing their users to summon a portal to the mortal realm. The book also notes that the crystals are often worn in jewelry.

Asmodean Crystals make their first physical appearance in "Unhappy Campers", where Blitzo forces a succubi to use an Asmodean Crystal disguised as a buttplug to summon a portal to where his sister was. Barbie Wire later uses her own Asmodean Crystal, which is disguised as part of her wristwatch, to remove her Human Disguise and then to return to Hell.

In "Oops", Stolas has a meeting with Asmodeus and asks him about giving Blitzo an Asmodean crystal for his business to access the mortal realm. Asmodeus declined due to Fizzarolli's hatred of Blitzo at the time, however after mentioning the request to Fizzarolli, Fizzarolli says to let Blitzo have it.

Trivia

 * Similar to Stolas's Grimoire, the crystals have portal-creating properties.
 * This may explain how Verosika Mayday and her posse are able to go yearly to Earth as seen in "Spring Broken".
 * It is currently unknown if Loona, Vortex, and Stolas also have access to these crystals, as none of them are succubi but have the ability to change into human disguises, however it's possible they can do so via magic rather than use of the crystals.
 * It is worth noting that Stolas has briefly mentioned in "Seeing Stars" how he needs the grimoire when asked by Blitzo if he could give them human disguises as well, insinuating that there is a specific spell that also has a similar effects to the Crystals' ability to disguise its wearers.

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