The Tuning ForkEdit
The Tuning Fork is an item from ancient times that can turn anything into any food or drink you so desire. The only problem is, everytime you consume a food the tuning fork made, you get hungrier and hungrier until you starve to death.
In book three it was first intorduced. A chef named Hugo wanted the Tuning Fork so he could complete his chocolate recipe, a chocolate that could mentally take you back in time. They wanted to make Cass eat it so that she could go back in time, discover the secret, and then tell it to them.