Somewhere in the depths of the underworld, there lives a giant creature called the Horerczy that belches swarms of shapeshifting butterfly demons known as alps. These little demons go out into the world seeking humans to sit on while they sleep, causing sleep paralysis, nightmares, and sometimes taking a sip or two of the humans blood. But when they are caught and vanquished, they disappear back into the mouth of the Horerczy. And sometimes, they tell stories of their adventures in our realm.