I mean, after killing Snape, shouldn't Voldemort have found that the wand in his hand still refused to show greater power for him? Try several random spells, the Dark Lord would find the wand works no better than when Snape is still alive, then he should realise there is something went wrong...
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2I'd be surprised if this wasn't a dupe.– TheLethalCarrot ♦Commented Jul 8, 2020 at 11:55
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26Voldemort's entire downfall was due to arrogance. I doubt he would have considered the possibility that he was wrong about the Elder Wand's allegiance twice. If he had tried several spells with the wand perhaps he would have noticed, but he had no reason - and not much time - to do that.– Anthony GristCommented Jul 8, 2020 at 13:37
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1Well, I believe, the Elder Wand was stronger than his regular wand, but it wasn't operating at full capacity due to him not being the true master, however, it was still stronger than his regular wand.– Anshuman KumarCommented Jul 9, 2020 at 9:19
3 Answers
It doesn't seem like he did much after that.
All he seemed to do was magnify his voice, cast the killing and Cruciatus curses, and a couple of silencing charms, none of which can visibly be lacking in power.
He did fight in the Battle of Hogwarts, but like PMar said, he wouldn't have noticed.
He frequently was too confident in his own theories and ideas.
He's acted (to his downfall) like this before; leaving the diadem in a room that obviously had been previously explored , just because he didn't want to admit he wasn't invulnerable. Proud people often believe what they want to believe.
''Killing'' Harry might've erased any doubts.
When he accomplished something he frequently blamed his wands for not being able to do, he might've felt it really did work well for him.
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4You don't need edit headings as we can tell from the revision history. I also moved the point to what is likely the relevant section but feel free to roll my edit back if you want.– TheLethalCarrot ♦Commented Jul 8, 2020 at 14:21
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2Actually, he did to a lot of stuff - the silencing charms kept breaking, as did the body bind curse on Neville. And he was duelling like he probably hadn't done in decades against hoardes of people in the great hall. I think there was plenty of time for him to realise the elder wand wasn't working, but he was to euphoric at finally apparently killing Harry Potter and subsequently stopping hundreds of magical people killing him. Commented Jul 8, 2020 at 18:40
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2It may be that when Voldemort visited the room of requirement, he had in mind his need for a room that only he knew about, and so the other bric-a-brac wasn't there at the time. Commented Jul 8, 2020 at 22:18
Voldemort couldn't have noticed that he still didn't command the Elder Wand, because he didn't actually use the wand enough after killing Snape. His first spell afterwards was the one to send his voice to everyone in the castle - and it would be very difficult for him to detect any weakness in that spell as he can see only one side of its effects.
After that spell, he is waiting for Harry in the Dark Forest, so the next spell he casts is the Avada Kadavra he used on Harry. He didn't notice any weakness in his command then because (a) The spell also knocked him out (for reasons unrelated to his command of the wand); (b) Narcissa Malfoy lied and said Harry was dead.
The next time he uses the wand is during the Battle of Hogwarts, at which time he is too caught up in the battle to be able to notice the wand not really working for him. He probably didn't notice until Harry himself pointed it out to him at the end [book, not movie].
I think the premise is wrong: First, the wand was working fine for him; second, he had no other theories as to possible owners; third, he had no idea what to expect from the wand anyway.
Other answers listed various spells he performed and any failures in those spells were not because of the wand, but because of Harry's sacrifice. So up until the moment of Voldemort's duel with Harry, the wand was working fine.
Part of the confusion here is that no one really knows what is supposed to be special about the wand, or is even sure that this wand even really is the elder wand of legend. Supposedly, the brother asked Death for a wand that was more powerful than any other, that made it's master unbeatable in a duel. Yet we know that many wizards have indeed died while wielding the wand. So clearly, it didn't work. But at the moment, Voldemort wasn't in a position to do a scientific comparison of relative power across multiple wands.
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1Emmm...I wonder, if Voldemort didn't except to get significant more power by being the owner of the Elder wand and satisfied at "it just works fine", why bothering kill Snape? It should be something worthy for the lost of a very good servant.– HarryCommented Jul 9, 2020 at 3:14
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1In the books, he explains the elder wand doesn't work for him as well as it should. Commented Jul 9, 2020 at 4:57
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3I recall Dumbledore explaining harry that the main reason Voldemort looked for the wand was he believed it will enable him to kill Harry, and that seemed to work out well until he found otherwise at the last minute.– ISAECommented Jul 9, 2020 at 23:03
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@marcellothearcane "The wand... resists me" You are right. So should he have not felt this "resistance" change? Perhaps my answer is wrong. I would love to ask JK Rowling what this "resistance" felt like. Commented Jul 10, 2020 at 14:32
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@MobyDisk The same weirdness Harry felt from the blackthorn, I should think. Like someone else's hand stitched onto your arm (or words to that effect). Commented Jul 10, 2020 at 14:48