"The spellbook for Incendio is behind this door, but so is the Vaults Guardian. If you want to unlock the door, you'll need five gemstones to create a special key. I cannot help you find them."
—A Gringotts goblin[src]

The Vaults Guardian was a giant Fire Crab placed in one of the vaults of Gringotts Wizarding Bank to guard the spellbook for the Fire-Making Spell contained within. Gaining access to the vault required a special key made of five different coloured gemstones.

Behind the scenes