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They used a combination of Polyjuice Potion on Hermione, human transfiguration on Ron, Harry's Invisibility Cloak to cover Harry and Griphook, and some well time Imperius Curses. They were discovered before they reached the Vault, but this did not stop them from accomplishing their task.

The most important aspect was having a former Gringotts goblin help them plan or they wouldn't know what kind of enchantments were there in the first place or how to get past them.

Second was have Bellatrix's own wand to prove as identification if Harry couldn't cast the Imperius Curse.

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