Queen's Token

This humble acorn is one of the mightiest gifts a faerie queen can bestow upon her subjects. While holding the acorn, a creature can use an action to cast the wish spell. After using the acorn in this way, it immediately teleports back to the queen who bestowed it. If the wish spell is used in a way that the queen would perceive as a threat to herself or her realm, the spell does not work. Instead, the creature who made the wish immediately transforms into an oak tree. Only a wish spell cast with the queen's token can return a creature transformed in this way to its original state.