This Harry Potter heat changing mug is sure to cast a magic spell over your morning brew. Cold, the mug shows Wormtail’s famous quote “The Dark Lord shall rise again”. When hot liquid is poured in, the mug transforms to reveal the menacing Dark Mark cast across the sky and the silhouette of Lord Voldemort’s Dark Mark branding symbol. Once the drink is finished the mug returns to its original state as it cools. An essential for any Harry Potter display.