Potion Made Me Do It Mug
The potion made you do it, after all. At first glance this is just an ordinary 11oz black ceramic mug, but thanks to special thermal coating the design appears on them, like magic, when you fill them with hot liquid.
Not microwave-safe, recommend hand washing for best product durability. Do not go from cold water immediately into boiling water and vice versa, as it may cause the mug to crack.