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. An essential for any Horcrux-hunting Harry Potter fan.