Hallow's End 2023 Introduction Questline (Story Spoilers)

wowhead.com:

With this week's Patch 10.1.7 PTR build, new Hallow's End content is available for testing! Included in this week's new build is a new questline that sets the updated story for the event and leads us into the newly revamped Scarlet Monastery. We checked out the questline to bring you the new story!

The questline starts with either Matron Mother Seacole by the gates of Stormwind or Calia Menethil by Grommash Hold in Orgrimmar. The quest A Ghostly Message mentions an individual named Thomas Thomson. According to the quest, this has called the attention of both NPcs when a tome belonging to Thomas suddenly dropped to the floor, open on a page with a single name on it. Yours. For those familiar with past lore, Thomas Thomson was once a Knight of the Silver Hand and after becoming cursed and driven insane in the Scarlet Monastery, he became the Headless Horseman in death, believing that he was alone alive, fighting against the undeath — In his mind, everyone. We're requested to find Thomas, his ghost trying to send us a message. And we find Thomas by the Scarlet Monastery in Tirisfal Glades. We find Thomas by the ramp leading to the monastery, along with a bunch of other ghosts. In Shades of Scarlet, Thomas seeks atonement for his sins as the Headless Horseman, starting with his family, whom he murdered in his madness — but his wife, Suzannah, cannot be found, almost as if she never existed. According to Thomas, Hallow's End draws out shades that haunt the Monastery, where they're condemned to walk the grounds and repeat their nightmares. One of the spirits confronted during this quest is that of Saidan Dathrohan — One of the first Paladins of the Order of the Silver Hand, and