Azkaban

Azkaban is the punishment the stories reach for when they want exile rather than a fine. Its guards, dementors, are less jailers than a climate. They chill a room and pull at memory. A defense associated with them is the Patronus charm, a concentrated happy memory given form.

The prison is also a moral test of the society that built it. Using despair as a sentence tells you what that government will tolerate. Later pages complicate who was locked up and why. Those complications are plot, and this note stops at the institution.

Names and functions only. No scene reconstruction.