A Goblet of Blood is an object used as a common form of communication between demons and their allies like the horsemen, but is not limited to them. The angels can use it as well, but grudgingly and only as a last resort.
The goblet itself is a rather large silver or brazen in color. It depicts numerous distorted faces, possibly that of demons or humans in pain.
The goblet requires blood from a human, although it is later revealed that dog blood could be used as well. This is usually procured fresh, most commonly from the slit throat of a victim. Once the goblet is filled with blood, the user recites an incantation, "Tire quiero patem me a di" and stirs the blood. The contents of the goblet then lights up and/or bubbles, indicating the goblet is ready for use. The goblet is sometimes depicted with a matching knife of similar design and color. However, it has been shown that the blood does not necessarily need to be spilled by use of a special knife.
This method of communication is very effective and appears infallible. It can work over large distances, and even through different dimensions, such as from Earth to Hell. As a magical object, it still functions even when used on an alternate reality where magic does not exist or is not usually usable.
Talking to Pestilence appeared to require a chant dedicated to the horseman. Brady used the following incantation, "Dis manibus praest praesens obtine mihi dominum. Pestilentiarum omnimum. A fly emerged from the goblet once the incantation was recited, indicating Pestilence answered the call.
Crowley has shown the capability to create a similar form of communication using only blood. When he was bound by Sam Winchester as part of the third trial to close the gates of Hell, Crowley bit Sam in the arm. Once he was out of view, Crowley spat out the blood he acquired into his palm and uttered a Latin incantation, allowing him to send a message to all demons without having to use a goblet. The incantation was "Inferni sectatores, nunc audite regem" (roughly translates to "Infernal followers, now listen to your king").
This method is similar to the one using a goblet, in that it is not affected by negation of spells. Crowley was bound with several demonic handcuffs and was trapped within a devil's trap and yet was able to send a message without fail, much like how Virgil successfully used a Goblet of Blood from an alternate reality that is devoid of any form of magic.
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- Out of the Darkness, Into the Fire (by Crowley)