How var Harrys ärr användbar som Dumbledore väntade?

Först och främst ett Guds Ord:

... In choosing which boy to murder, he was also (without realising it) choosing which boy to anoint as the Chosen One – to give him tools no other wizard possessed – the scar and the ability it conferred, a magical window into Voldemort's mind (JKRowling.com FAQs, "What is the significance of Neville being the other boy to whom the prophecy might have referred?").

För det andra, en samling citat från Deathly Hallows , för att bevisa att ärret verkligen var mekanismen för mental relation:

“But it was supposed to have stopped! Your scar – it wasn’t supposed to do this anymore! You mustn’t let that connection open up again – Dumbledore wanted you to close your mind!”

och

Harry felt badgered, confused, and Hermione did not help as she said in a frightened voice, “Your scar, again? But what’s going on? I thought that connection had closed!”

“It did, for a while,” muttered Harry; his scar was still painful, which made it hard to concentrate. “I – I think it’s started opening again whenever he loses control, that’s how it used to – ”

och

He wished that he had not told them what he had seen and felt; it made Voldemort more threatening, as though he were pressing against the window of the room, and still the pain in his scar was building and he fought it: It was like resisting the urge to be sick.

och

“I know it was your scar! I can tell by the look on your face! You were looking into Vol – ”

och

His scar burned, but he was master of the pain, he felt it, yet was apart from it. He had learned control at last, learned to shut his mind to Voldemort, the very thing Dumbledore had wanted him to learn from Snape.

och

The goblin looked slantwise at Harry, and the lightning scar on Harry’s forehead prickled, but he ignored it, refusing to acknowledge its pain or its invitation.

och

Judging by their worried looks, and by the continued pounding of his scar, his sudden excursion into Voldemort’s mind had not passed unnoticed

Harry själv noterar att han använder den för att fräsa information:

“Harry, you aren’t supposed to let this happen anymore!“ Hermione cried, her voice echoing through the bathroom. ”Dumbledore wanted you to use Occlumency! HE thought the connection was dangerous – Voldemort can use it, Harry! What good is it to watch him kill and torture, how can it help?“
“Because it means I know what he’s doing,” said Harry.

och

Harry wished his scar would burn and show him Voldemort’s thoughts, because for the first time ever, he and Voldemort were united in wanting the very same thing

och i slutet i Hogwarts:

“You need to find out where Voldemort is, because he’ll have the snake with him, won’t he? Do it, Harry – look inside him!”

Why was it so easy? Because his scar had been burning for hours, yearning to show him Voldemort’s thoughts? He closed his eyes on her command, and at once, the screams and bangs and all the discordant sounds of the battle were drowned until they became distant, as though he stood far, far away from them…

Det fungerar som taktisk Voldemort detektor , så att Harry vet när Voldemorts farligt närmar sig eller närmar sig, varnar honom:

. Harry raised his wand, but as he did so, his scar seared more painfully, more powerfully than it had done in years.
“He’s coming! Hermione, he’s coming!” (DH, in Bathilda Bagshot's house)

och

then the scar on his forehead burned like fire: as a Death Eater appeared on either side of the bike, two Killing Curses missed Harry by millimeters, cast from behind – And then Harry saw him. Voldemort was flying like smoke on the wind, without broomstick or thestral to hold him, his snake-like face gleaming out of the blackness, his white fingers raising his wand again – (DH, Battle of Seven Potters)

och

“Good!” she leered. “Draco, pick them up! The Dark Lord is coming, Harry Potter! Your death approaches!”

Harry knew it; his scar was bursting with the pain of it, and he could feel Voldemort flying through the sky from far away, over a dark and stormy sea, and soon he would be close enough to Apparate to them, and Harry could see no way out. (DH, Malfoy Manor)

... (same place) ... Harry’s scar was blinding him with pain. Dimly he knew that they had moments, seconds before Voldemort was with them.

Det är ett varumärke, en identitet . Både för Harry och för hans supportrar

“Indeed they are, Romulus,” said Lee, “so we suggest that you continue to show your devotion to the man with the lightning scar by listening to Potterwatch! (DH)

Strategisk "Är Voldemort fortfarande levande" detektor

The scar had not pained Harry for nineteen years. All was well. (DH, Epilogue)