Limbium is a medicine that directly affects the elves' Limbic System, the emotional center of the brain, and the root point of any special ability.

In the book series, Keeper of the Lost Cities, Sophie Foster has a horrible allergic reaction to only a drop of Limbium. Later, in Exile, Mr. Forkle gave her an entire ounce of Limbium and then gives her a modified human medicine to stop the reaction. This occurs because Sophie's abilities were malfunctioning and limbium was the only way to fix it. Doing so created a star-shaped scar on one of her hands.

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