The wizard who casts this spell gains the ability to speak with any voice he desires: a man's, a woman's, a grandparent's - even a baby's. It is an extremely useful piece of magic, to be sure, but one famous for causing untold confusion, conflict, and - regrettably - a short war. Be careful when using your newfound vocal talents within earshot of unsuspecting humans.
Mimic is a spell that allows the caster to perform uncanny impersonations upon demand. Oliver obtains this spell in the Fairyground from the Fairy Godmother. It is, however, unusable.