Holly- Backup Acorn

  Artemis unzipped Captain Short’s tunic. There were two tiny items on the gold chain around her neck. Her copy of the Book, the fairy bible. Artemis knew that it would combust if he tried to touch it without Holly’s permission. But there was another item. A small Plexiglas sphere filled with earth.

  “That’s against regulations,” said Root, not sounding too upset.
...
  Artemis ignored her, cracking the tiny sphere against the carriage floor. Earth and a small acorn tumbled into his palm.

  “Now all we need to do is bury it.”

-The Arctic Incident, Chapter 8