The Arithmancy classroom looks very much the same as it did last lesson - neatly-positioned rows of wooden desks and chairs, different colored cushions resting in a pile by the door for you to choose from to match your comfort and liking. The wooden shelves lining the walls are still not filled with Professor Shackleton's collection of books and the two large cardboard boxes that were sitting on the floor in front of the shelving unit last class are still present, unmoved from their original spot.

As you enter the room, you see Professor Shackleton sitting at her desk, her jade-colored robes partially covered by a thick-woollen yellow shawl. On the desk is a lesson plan for today's lesson, the course textbook, and a small pouch that she keeps very close by her left hand. Despite the smile on her face, it is apparent in her appearance and body language that she is not entirely well. Her skin has a slight greenish tinge to it, her shoulders are slightly hunched, and her brow glistens ever so slightly with perspiration. She invites you to choose your seat and open your textbooks to Chapter Twenty.