The Cup can also provide control over demons.
The Angel Raziel gave the Mortal Cup, with a bit of his angel blood in it, to a mundane who became the first Shadowhunter. Because of this, all Shadowhunters have a touch of Raziel's blood in their veins. Despite this, it became forbidden to use the Cup again to rebuild their forces.
In the 1990s, Valentine Morgenstern advocated for the use of the Cup to create more Shadowhunters. When the Clave refused, he and his followers stole the Cup—which had been put on display for the signing of the Accords as a show of power. Though he succeeded, his plan was foiled when his wife Jocelyn and his former parabatai Luke confronted him. Jocelyn took the Cup with her and went into hiding. Jocelyn, with her unique angelic power, painted the Cup into an Ace of Cups tarot card which she gave to her warlock assistant, Dot. Valentine scoured the world in search of Jocelyn and the Cup, and his men only caught up eighteen years later in New York.
What followed was a wild goose chase hunt for the Cup as the leaders of the vampires and werewolves began vying for possession of the Cup themselves: Camille Belcourt because she wanted to control the Cup and those who want it, and Theo, because he didn't trust the Shadowhunters to safeguard the Cup and was tired of their superiority over them. Clary eventually figured out her shared power with Jocelyn and realized where the Cup was. They took the card, which had been in police custody during the investigation into Luke, and Clary was able to take the Cup out of the card after she was cornered by a Shax demon; she then used it to control the demon. The Cup was surrendered to the Clave and hidden in Lydia Branwell's office at the New York Institute, only to be stolen by Hodge Starkweather for Valentine.
Valentine went on to use the Cup create his own Shadowhunter army with his followers and other willing recruits. When man of his men who drank from the Cup began to die, they abducted fighters from dojos to turn.