

Invocations
The power of a demon's name is such that invoking it, even in conversation, is enough to draw that spirit's attention, no matter how far away he may be. What's more, the subject can attempt to ascertain who is speaking about him, where that being is even what is said.
Demons take notice whenever their Celestial or True Names are spoken. The feeling manifests differently for each. Some experience a chill that races across their skin or down their spine, while others feel an invisible pull that tugs at their mind. If a character concentrates, she can attempt to determine who is using her name and why. Make a Faith roll (difficulty 7 if the Celestial name is invoked, difficulty 6 if the True Name is used). The amount of detail gained depends on the number of successes rolled.
One Success: The character receives a mental picture of the person who invokes her name.
Two Successes: The character receives a mental picture of the speaker and his immediate surroundings, including the individual(s) he addresses.
Three or more Successes: The character can hear what the speaker is saying for the duration of a single turn. Is she wishes, the character may continue to eavesdrop on the conversation, though she only hears only the voice of the individual who invokes her name. Eavesdropping on the conversation requires a successful Willpower roll (difficulty 8) in each successive turn. If the roll fails, contact is lost.
There is no distance limitation on this ability, not even between the physical and spirit realms.
The capacity to establish a connection between individuals by invoking names of power also allows demons to communicate with one another and their thralls no matter how far apart they are. To communicate with another demon, the character needs either the recipient's Celestial or True name, and must have at least one point of temporary Faith available. Make a Faith roll (Difficulty 7 is using a Celestial Name, 6 if using a True Name), and if successful, whatever the character says is heard by the recipient. Once this connection has been made, the recipient can reply if she has at least one point of Faith available in her Faith pool. Note that the recipient doesn't have to know the speaker's name to reply. Once the link has been established, it can be used by both parties. Contact lasts for the duration of a single turn. If the speaker (or the recipient of the invocation) wishes to continue the conversation, you must make a successful Willpower roll (difficulty 6) in each successive turn of communication. If the roll fails, contact is lost.
This ability is not limited to one-on-one communication. A demon can direct her message to multiple recipients in different locations up to a number equal to her Faith rating. The player need make only one Faith roll to send a message, and the difficulty is 7 regardless of the names used for the invocation. Otherwise, group communication use the same rules already described.
In the case of thralls, communication is automatic. The bond that already exists between mortal and demon provides the needed link, allowing a demon to contact her thralls without requiring a Faith roll. Additionally, a demon may address multiple thralls at once equal to her Faith score. Unless a thrall is specifically gifted with the ability to perform an invocation, though, she cannot initiate contact with the demon. In most cases, thralls speak only when spoken to.
Though there is no known way for an outside party to "tap into" this form of supernatural communication, nearby demons can detect its use as they would any other use of supernatural power. Likewise, since the participants must physically say what they want to convey, even as a whisper, it's possible for sharp ears to overhear at least a part of what is said.