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Spoiler warning!
This article contains plot details from the latest books.


An Ionic Booster is an invention that provides a boost of energy to muscles. Sophie was given one by Tinker to boost her non-dominant (left) hand in Flashback, because of the injury to her dominant (right) hand obtained during Umber's attack. It is described as a plain silver bangle that fits snug just above her elbow.

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