"Some day yew folks'll hear a child o' Lavinny's a-callin' its father on the top o' Sentinel Hill!" - Old Whateley
Its existence was kept secret by its grandfather, mother, and eventually its twin brother, Wilbur Whateley. It fed on cattle growing up, draining them of blood before devouring them completely. The intense stench of the abomination kept away most passersby.
On September 9th 1928, the creature broke free from the Whateley farmhouse, littering the hillside with wooden planks soaked with an odd viscous substance. Barrel-sized tracks were found leading to a meadow where half a herd of cows were drained of blood.
In its natural state the being is invisible to the human eye, but a magical spell can render it visible.
Its final words were a cry of help to its father, after which the creature was destroyed for good by the spell cast by Henry Armitage and his colleagues, its essence banished back to the realm of its father.