Valerius pauses in the stairwell, furrowing his brow, as the words of the chanter reach him. He shakes his head, and continues up the stairs, quickening his pace.
Fresh from a visit to some friends in Sembia, he's dressed in breeches and tunic rather than his usual robes of office: A feathered cap sits atop his head, hiding his horns. He had already made a report of the situation to a gathering of friends and guests, he had already assured that Auriel was all right, and he had already discussed Candlekeep's defenses with Gatewarden Isabella Villame. He had just one more thing to do before he could sleep.
Stepping into his quarters, he shuts the door, and fights off a wave of nausea. "Getting sick." He observes to himself, touching his forehead again. Cold and clammy. "Mm."
He moves to his desk, sweeping some work aside and pulling out crisp, expensive, and official-looking paper. He sits, and painstakingly scribes several letters over the next two hours.
One is addressed to the Council of Four, the dukes of Baldur's Gate, and it reads as follows:
Honorable Council:
The night has never been safe, but it remains more dangerous now than ever before. As you may already know, there have been a rash of abductions in recent days. A malicious entity who speaks in rhyme and song -- self-identified as the "Herald of Darkness," but herein referred to as the "shadow-singer," -- has been targeting women and stealing them away in the dark of the night. His motives appear to be based around a strong and unyielding hatred for womankind.
No history or tale of this shadow-singer can be found in any of Candlekeep's records. No record of strange disappearances involving darkness or any record of similar occurrences taking place can be found, with the possible exception of the drow shade, Onyxium, who does not appear to be associated with these current incidences. Whatever this case is, it is isolated, and unique.
From what I have gathered from witnesses to the attacks, from first-hand experience, and from informants and friends in Selgaunt and elsewhere, I have determined that Shar has shown incredible favor to this shadow-singer by mixing her voice with his. His ability to have his presence anywhere under the darkness of night is very similar to Shar's attributes regarding the night. His ability to control and create being such as Nightwalkers on mere whim, as well as his ability to transport individuals at will through the night (even past Candlekeep's wards) show signs that Shar's power is not only potent within him, but focused within him. This being that we are dealing with is powerful by himself, and directly behind him stands a greater deity.
Extreme caution must be exercised from now on. If this man has been given such incredible attributes by Shar, he will be beguiling and persuasive. At any moment, any of our friends could be turned against us, and old enemies can be spurred to strike. Any creature that lurks in the shadows or night is to be feared, as he could easily sway them against us. Indeed, already he has organized the vampires of the Cloakwood behind his cause.
Every step must be taken with caution. One step too far will provoke this being, and the results could be irreversible. I have established a curfew in Candlekeep, and am requesting that visitors and residents alike make their ways indoors after nightfall. I might encourage similar edicts for Baldur's Gate, though I know how difficult that would be in a metropolis of its size. Suffice it to say, this threat is, at present, worrying on an individual level -- we all know women we want to protect -- but it could potentially become a very serious and very large threat to us all.
If this being is, indeed, gathering the forces of darkness, it would be wise for us all to keep a close watch over our peoples, and over this shadow-singer's future actions.
Thank you for your patience, and I wish you the best of luck in protecting your citizenry and demesne.
Yours sincerely,

Valerius, Guide of Candlekeep
"One down. Three more."
Another very similar letter is directed to Captain Crownsilver of the Flaming Fists. While letters are also directed to the mayor and high priest of Beregost, Kelddath Ormlyr, and to Valerius's friend and associate, Davian Thule, also of Beregost's Temple of Lathander.
Once finished, Valerius sets them aside to be run out first thing in the morning, and makes his way to bed. Hopefully he would feel better after a good night's sleep. The day had been long and trying. But he would not fail his friends again.