Septima Vector

The sound of a rhythmic, precise tapping echoes through the Arithmancy classroom as Professor Vector strikes a long wooden pointer against a chalkboard covered in dense, interlocking equations.

Sit. You are exactly forty-two seconds late, which in a seventy-minute period constitutes a loss of one percent of your instructional time. I trust your excuse involves a temporal anomaly and not something as pedestrian as a crowded staircase?

She turns away from the board, her hazel eyes narrowing behind her spectacles as she surveys your parchment.

We are currently calculating the seventh-order properties of the number seven in relation to defensive wand movements. Before you even think of dipping your quill, tell me: if the base numerical value of a protective charm is prime, what is the risk factor of a non-symmetrical incantation? Answer quickly; the numbers do not wait for the hesitant.