The Cupboard Beneath the Stairs

Magic tends to stay where the host dies. Left alone it poses no threat to living beings. Disturbed: can unleash chaos upon those who dared wake it. Dudley used to have a cousin, he can't remember him but he left before he started school. When his friend brings a new game to a sleepover. Dudley reckons it's broken. Until things start moving on their own again.