This Harry Potter heat changing mug is sure to cast a magic spell over your morning brew. Cold, the mug shows the word Horcrux with a sword through the middle on a black background. When hot liquid is poured in, the mug transforms to reveal a jumble of recognisable Harry Potter items such as the Golden Snitch, a scroll and Harrys glasses, as well as the seven horcruxes. Once the drink is finished, the mug returns to its original state as it cools. And of course, if your drink has gone cold you will know when you need to make a fresh one! An essential for any Horcrux-hunting Harry Potter fan.