The large cup which selects the champions to compete in the Triwizard competition.
Sirius Black in the prisoner. He broke the prison and escape. He was narrated as an enemy of Harry but proved to be his ‘Godfather’.
The chamber preserves the secret of the dairy of Tom Riddle which is the horcrux.
: It is the stone which can help in the making of Elixir of Life. it supposedly had the abilities to turn base metal into gold, and produce the elixir of life