- "Oh yeah. Firs' we presented him with a nice battle helmet -goblin-made an' indestructible,
yeh know - an' then we sat down an' we talked."
- — Hagrid telling Harry, Hermione and Ron about the mission he went on for Dumbledore.[src]
A Goblin-made battle helmet is known to be indestructible.
History
This was one of the gifts that Rubeus Hagrid and Olympe Maxime brought with them on their mission for Dumbledore. It was given to the Gurg of the giants, who upon their arrival was Karkus.