`azkaban,

Azkaban is a the jail for wizards and witches. The prisoners there are guarded by Dementors. These creaters are the guards who put fear into the people they are watching. They are able to suck the life from any person they wish. But they are under control of the ministry of magic. They feed on positive emotions, which means that after spending much time in the prison, the prisoners lose all hope and all good feelings and thoughts. The prisoners are forced to relive the darkest, most horrible memories of their lives. Some go mad, others simply despair and die.