Why can house elves Apparate in Hogwarts?

House-elves could also Apparate, but without some of the restrictions that wizards had, due to their unique type of magic. For example, they could Apparate inside Hogwarts and even the Crystal Cave, where powerful enchantments prevented witches and wizards from doing so.

What is wrong with Kreacher?

Regulus also ordered Kreacher to never tell his family what had happened to him. Kreacher left as ordered but was unable to destroy the locket, despite his many attempts. This inability to complete an order of his master may have driven him to insanity, explaining his muttering and devotion to his mistress’ painting.

Did yaxley get into Grimmauld Place?

Therefore Yaxley did not see Grimmauld place. The way the fidelius charm is explained is you have to intentionally give the secret away. Therefore when Hermione accidentally let Yaxley tag along she was not giving him the secret willingly, and it would not have been revealed to him.

Why did Voldemort take Kreacher with him to the cave?

In order to test out the substance he’d left in the bowl containing the Horcrux, Voldemort took Kreacher with him to the cave. In true Dark Lord fashion, Voldemort had no problem if Kreacher was killed by the Inferi. However, Kreacher was able to Apparate due to house-elves magic being different compared to wizards.

What does Dumbledore say about Kreacher?

—Albus Dumbledore regarding Kreacher. Kreacher was a male house-elf who served the House of Black with fanatical loyalty for most of his life, until he was left to Harry Potter upon the death of Sirius Black in 1996.

What if Voldemort had just used the horcrux on Snape?

If Voldemort had simply used it then Harry would never have gained Snape’s memories and known what he had to do to win. In order to test out the substance he’d left in the bowl containing the Horcrux, Voldemort took Kreacher with him to the cave.

How did Kreacher get forced to drink the Emerald potion?

— Kreacher telling Harry Potter, Ronald Weasley and Hermione Granger the tale of him being forced to drink the Emerald Potion by Voldemort [src] In 1979, when Lord Voldemort told Regulus Black that he needed a house-elf, Regulus volunteered Kreacher, saying it would be an honour to serve the Dark Lord.