To be fair to Charon, I've posted the exerpt in GURPS for the Voiceless One.
"The Voiceless One"
Perhaps the most mysterious of the Fallen Lords, the Voiceless One slipped through the night on missions that even Balor could not be sure he fully understood. Her name was Ravanna, and she was called the loveless child of the unwed dawn.
An alert Heron reported back to Alric that the Deceiver called Shiver "Ravanna" in his final confrontation with her, and that immediately afterward she quit taunting him and began unloading her mightest magics at the Deceiver instead. Alric suspects this would indicate some sort of strange relationship between Shiver and the Voiceless One, but the Deceiver has remained true to form and enlightened no one.
It is known that Balor revived the Voiceless One from eternal sleep. It could be that Shiver and she are the same, Shiver was on her second and third lives in Balor's and Soulblighter's wars respectively, and [then] the last Fallen Lord has yet to be named."