Not every Seraph Falls for the exact same reasons. Some Fall for lying, others for disobedience to their Archangels. Some Fall from trying to rationalize their lies, attempting to play mind games with themselves about what is and is not true. These fallen Seraphim become the Ha-satanim.
The Ha-satanim occupy an interesting position in Hell. Everybody wants to know if they are being lied to, but nobody wants others to know that they are lying. And the Ha-satanim know, and use that knowledge to prove that they are as fit to survive as anyone else.
As a result the Ha-satanim may, through an effort of will, invade the thoughts of a speaking individual and determine whether the individual believes their statement to be true. The soul of the speaker may be laid bare to the gaze of the Ha-satanim, allowing the demon to perceive just what the person really thinks about what he is saying.
Other Bands are ambivalent about the Ha-satanim, especially since there are comparatively few of them to form opinions about. Typically they are tolerated, unless they begin to challenge the statements made by other demons. Then the Bands grow hostile...
Oddly enough, the Balseraphs actually like their Ha-satanim cousins. At least as much as a Balseraph likes anyone, that is. The Ha-satanim resonance is powerless against the resonance of the Balseraphs, because the Balseraph always believes his statements to be true.
Unlike the Balseraphs, the Ha-satanim do not see themselves as stringed instruments. They think of themselves as chimes and bells, instruments which require a delicate hand to play properly.
It is important to remember that the Ha-satan resonance has no connection to the Symphony. As a result, they cannot ever perceive the Truth. They may only perceive truth as the target of their resonance understands it.
A Ha-satan also possesses two serious risks with his resonance. If he ever fails his resonance with a check die of 6, he must immediately make a new resonance roll. The original subject of the resonance then receives the appropriate amount of information about the last statement the Ha-satan made to him. In addition, if a Ha-satan ever successfully resonates a Seraph with a check die of 6, he gains no information at all. Instead, he makes temporary contact with the Seraph’s connection to the Symphony and is blinded by it. The Ha-satan may not use his resonance again for a number of hours equal to the Seraph’s Celestial Forces, and the Seraph becomes aware that there is a demon nearby.