The role of the prophecy ball in Harry Potter. What happens when it breaks down?

Voldemort can know what will happen by predicting the ball. After it was broken, white fog came out of the prophecy ball. A voice can be predicted again, but others can't hear it, only Harry can hear it.

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In order to get the record of sibyll trelawney's prophecy, Voldemort led eleven Death Eaters into the Department of Mysteries through lucius malfoy's insiders, and misled Harry and others to be present in an attempt to steal the prophecy ball by his hand. However, six members of Dumbledore's army who were present refused to give in easily and fought back to break through, resulting in the destruction of the prophecy hall and the time hall.

Extended data

In the subsequent battle between the Death Eaters and members of the Order of the Phoenix and Dumbledore's army, the prophecy ball was destroyed. The only records exist in the minds of albus dumbledore and Harry.

Dumbledore revealed the secret of prophecy after the war. Whether Voldemort can get into Harry's brain and understand the details of those predictions, or whether he thinks such an attempt is valuable, is uncertain. The Death Eaters learned in the Prophecy Hall that Harry didn't know the details of the prophecy before the war.

At the end of July, after the war of the Department of Mysteries, the Minister of Magic publicly admitted that Voldemort had returned in an interview with daily prophet. Since then, Voldemort no longer has to be careful to avoid revealing his whereabouts.