House-elves have their own brand of magic, as do many other magical creatures. Their magic allows them to perform tasks, such as Apparating, where wizards cannot. More than just a mere housekeeper, a house-elf is a ruthless protector of the master, and will attack threats with great fury and strength.
When Harry Potter inherited 12 Grimmauld Place and Kreacher in 1996, Albus Dumbledore wanted to test to see if Harry had truly inherited his godfather's possessions. Harry was told to give Kreacher an order. At the time, the only thing he wanted was for Kreacher to shut up. He told him to do so, and instantly, Kreacher almost choked on his own words.
To test the security around the locket Horcrux in the 1970s, Lord Voldemort required a house-elf for the job, and Regulus Black nominated Kreacher. After using Kreacher for his purposes, Voldemort left him there to die. Bound by the laws of his kind, Kreacher was able to Disapparate out of the cave and return to Regulus because Regulus had told Kreacher to return after the task was finished.
In LEGO Harry Potter: Years 1-4
In the LEGO Harry Potter: Years 1-4 level, Dobby's Plan, Hermione Granger and Ron Weasley try and capture Dobby while he curses the rogue bludger. Whenever Dobby would be hit, he would Apparate to the next location. When playing as Dobby in levels, the only spell he had was the Hover Charm inspired by the charm he used on Aunt Petunia's pudding.
- Harry Potter and the Chamber of Secrets
- Harry Potter and the Chamber of Secrets (film)
- Harry Potter and the Half-Blood Prince
- Harry Potter and the Deathly Hallows
- Harry Potter and the Deathly Hallows: Part 1
- LEGO Harry Potter: Years 1-4