By Teresa Jue
Updated December 17, 2014 at 02:43 PM EST

Judging from the past few days, it seemed like the new material in this “12 days of Pottermore Christmas” was probably just the riddles. However, today’s backstories were a bit juicier, as they addressed the fan theory that says Snape is a vampire.

As we hit the midway point of the 12 days of Pottermore Christmas, today’s riddle brings us back to Slughorn’s Christmas party in the Half-Blood Prince:

With vampires and authors and a gatecrashing Malfoy,

Slughorn’s Christmas party is one for (almost) all to enjoy,

much to the surprise of fans, friends and the rest,

which loony Ravenclaw does Harry bring as a guest?

Loony? Ravenclaw? No duh—it’s Luna Lovegood. Today’s treat is an animated invitation to Professor Slughorn’s Christmas Party, where the site opens up to some festive music and a party scene full of wizards and witches.

We also get a new piece titled “Vampires,” a subject which Harry and the rest of the students learned about in their Defense Against Dark Arts classes. And yes, there were vampires in the Hogwarts world; according to the passage, one such vampire, Sanguini, made a “comic appearance” at Slughorn’s party. Likewise, J.K. Rowling reveals that in her earlier drafts, she came up with a vampire, “Trocar,” who never made it into the books.

Rowling also dispelled rumors that Snape is a vampire, noting, “While it is true that he has an unhealthy pallor, and is sometimes described as looking like a large bat in his long black cloak, he never actually turns into a bat, we meet him outside the castle by daylight, and no corpses with puncture marks in their necks ever turn up at Hogwarts. In short, Snape is not a re-vamped Trocar.”

Head on over to Pottermore to “join” (a.k.a. click on) the holiday festivities.