In chapter 50, in Mary’s room before leaving on the Azkaban mission:
Professor Quirrell gestured for the door to close and lock, and began to speak twenty-nine security Charms, one of the ones in Mr. Bester’s sequence being left out this time, which somewhat puzzled Harry.
Quirrel casts the full 30 charms during their previous secret talk in Mary’s room (a week before), and he casts all 30 charms when they reach the warehouse (before entering Azkaban).
IIRC, The two security charms we specifically know about are those to check for powerful artifacts and Animagi. Now, we know that Harry’s Invisibility Cloak is apparently never detected by the former spell, so I suspect that anything in Harry’s bag is not detectable by these means. Therefore, I propose that Quirrell left either a small Animagus or Magical Artifact in Harry’s bag when he entered as a serpent.
As to why specifically he’d do that, I don’t think we have enough information to speculate.
Actually if I remember correctly during the bully final showdown Hermoine gets scared because she recognizes one of the charms as one that would detect Harry’s cloak in the area if not find it directly.
Fully two dozen different Charms must have been spoken, then, but no more invisible people showed up. One of them in particular made Hermione’s heart sink; she recognized it as the Charm which had been listed alongside the description of the True Cloak of Invisibility, which would not reveal the Cloak, but would tell you whether it or certain other artifacts were nearby.
To clarify when I said ‘actually . . . .’ i meant to disprove that assertion not support it.
“Professor Quirrell had already deduced my possession of an invisibility cloak,” Harry said. “And knowing him, he has probably guessed that it is a Deathly Hallow. But in this case, Headmaster, it so happens that Professor Quirrell was under one of those face-concealing white robes.”
Edit in response to your edit: You lost me.
To clarify when I said ‘actually . . . .’ i meant to disprove that assertion not support it.
The example you gave was not an instance of Harry’s Cloak being detected or not-detected, so it doesn’t prove anything one way or another.
Harry would have noted if an alarm went off or the cloak started glowing or buzzing or whatnot. That would be the way an ancient artifact would be revealed, right?
One of them in particular made Hermione’s heart sink; she recognized it as the Charm which had been listed alongside the description of the True Cloak of Invisibility, which would not reveal the Cloak, but would tell you whether it or certain other artifacts were nearby.
I assumed the caster of the spell silently becomes aware of the fact “there is an artifact nearby”. I guess it might be possible it sounds an alarm instead, but that would require that mokeskin pouches can beat artifact-detecting spells, which seems unlikely.
If, say, Rita Skeeter knew or guessed that we would come here, it is possible that she could be in this room wearing the true Cloak of Invisibility. Or she could be an Animagus with a tiny form, perhaps. There are tests to rule out such rare possibilities, but to perform all of them would be arduous.
Professor Quirrell grinned, then took out his wand and flicked it in the direction of the door. “Of course,” he said, “people who lead interesting lives take precautions more thorough than the dalliers. I have just sealed us in. Nothing will now pass in or out of this room—through the crack under the door, for example. And...”
Professor Quirrell then spoke no fewer than four different Charms, none of which Harry recognized.
“Even that does not really suffice,” said Professor Quirrell. “If we were doing anything of truly great import, it would be necessary to perform another twenty-three checks besides those. If, say, Rita Skeeter [...]
Which raises the question of what the last two Charms in the set of thirty are; but the clear implication is that the spell that would detect the presence of the Cloak of Invisibility is part of the “twenty-three checks” which he performs on other occasions in Harry’s presence.
That was actually called the Caterwauling Charm, though. There’s another detection spell in DH: Hominem Revelio. The only known effects of this spell are (i) the ‘swooping sensation’ experienced by a detected person and (ii) the lack of any alarm when nobody is detected. It’s likely, however, that there is no alarm even when persons are detected; when it’s used against Harry, Ron, and Hermoine by Death Eaters there is no alarm mentioned in the text.
If this is directly explained somewhere, I can’t find it. I see two possibilities- something to do with leaving the room via travelling back in time, or something to do with their future versions getting back in the room immediately after they leave.
Their future persons are in that room, under the Invisibility Cloak. The skipped one is the one that detects it, because it’s awkward to interact with your future self.
It’s a clue to readers who haven’t read the whole arc, yet, of what all Quirrell plans are.
In the next thread Xachariah pointed out that Quirrel likely has possession of the resurrection stone and was very recently(at that point in the story) told by Harry how to identify it. Given Locke’s observation in his reply that one of the two privacy spells that have been identified is to detect powerful artifacts it would make sense that Quirrel omitted the spell to detect power artifacts because he had the resurrection stone in his possession. I am not sure why the resurrection stone would be useful for the mission, but surely Quirrel could find something interesting to do with it in that context.
There has also been some speculation that Harry’s fathers’s rock is the philosophers stone. I am not sure why people would be storing important artifacts on Harry’s person, but it would be hilarious to find out that Quirrel stored the resurrection stone in Harry’s pouch while he was in there.
In chapter 50, in Mary’s room before leaving on the Azkaban mission:
Quirrel casts the full 30 charms during their previous secret talk in Mary’s room (a week before), and he casts all 30 charms when they reach the warehouse (before entering Azkaban).
So, anyone have an idea what this is about?
Maybe one of the charms protects against time-traveling in and out of the room?
IIRC, The two security charms we specifically know about are those to check for powerful artifacts and Animagi. Now, we know that Harry’s Invisibility Cloak is apparently never detected by the former spell, so I suspect that anything in Harry’s bag is not detectable by these means. Therefore, I propose that Quirrell left either a small Animagus or Magical Artifact in Harry’s bag when he entered as a serpent.
As to why specifically he’d do that, I don’t think we have enough information to speculate.
Refresh my memory: how do we know this?
Actually if I remember correctly during the bully final showdown Hermoine gets scared because she recognizes one of the charms as one that would detect Harry’s cloak in the area if not find it directly.
Yes, but Harry’s Cloak wasn’t anywhere near there, so...
Fully two dozen different Charms must have been spoken, then, but no more invisible people showed up. One of them in particular made Hermione’s heart sink; she recognized it as the Charm which had been listed alongside the description of the True Cloak of Invisibility, which would not reveal the Cloak, but would tell you whether it or certain other artifacts were nearby.
To clarify when I said ‘actually . . . .’ i meant to disprove that assertion not support it.
Edit in response to your edit: You lost me.
The example you gave was not an instance of Harry’s Cloak being detected or not-detected, so it doesn’t prove anything one way or another.
Harry would have noted if an alarm went off or the cloak started glowing or buzzing or whatnot. That would be the way an ancient artifact would be revealed, right?
I assumed the caster of the spell silently becomes aware of the fact “there is an artifact nearby”. I guess it might be possible it sounds an alarm instead, but that would require that mokeskin pouches can beat artifact-detecting spells, which seems unlikely.
My bet, honestly, is that the Cloak of Invisibility laughs at artifact-detecting spells.
Which raises the question of what the last two Charms in the set of thirty are; but the clear implication is that the spell that would detect the presence of the Cloak of Invisibility is part of the “twenty-three checks” which he performs on other occasions in Harry’s presence.
I’m fairly certain that’s how detection spells work though. In Deathly Hallows there were blaring alarms when the gang apparated into Hogsmead.
That was actually called the Caterwauling Charm, though. There’s another detection spell in DH: Hominem Revelio. The only known effects of this spell are (i) the ‘swooping sensation’ experienced by a detected person and (ii) the lack of any alarm when nobody is detected. It’s likely, however, that there is no alarm even when persons are detected; when it’s used against Harry, Ron, and Hermoine by Death Eaters there is no alarm mentioned in the text.
If this is directly explained somewhere, I can’t find it. I see two possibilities- something to do with leaving the room via travelling back in time, or something to do with their future versions getting back in the room immediately after they leave.
Their future persons are in that room, under the Invisibility Cloak. The skipped one is the one that detects it, because it’s awkward to interact with your future self.
It’s a clue to readers who haven’t read the whole arc, yet, of what all Quirrell plans are.
In the next thread Xachariah pointed out that Quirrel likely has possession of the resurrection stone and was very recently(at that point in the story) told by Harry how to identify it. Given Locke’s observation in his reply that one of the two privacy spells that have been identified is to detect powerful artifacts it would make sense that Quirrel omitted the spell to detect power artifacts because he had the resurrection stone in his possession. I am not sure why the resurrection stone would be useful for the mission, but surely Quirrel could find something interesting to do with it in that context.
There has also been some speculation that Harry’s fathers’s rock is the philosophers stone. I am not sure why people would be storing important artifacts on Harry’s person, but it would be hilarious to find out that Quirrel stored the resurrection stone in Harry’s pouch while he was in there.