Artemis examines Holly's prototype acorn unit

The Sealed Acorn Unit is a glass box that allows a Fairy to keep their acorns fresh to bury and refresh their powers, without having to pick one fresh. This proves useful as it saves Holly Short's life in the The Arctic Incident.

At the time, it was only a test and technically illegal. When Foaly presented his idea to the Fairy Council, they dismissed it as a mar on the fairies' sacred traditions.

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