Boohemoth

Boohemoth is a type of Big Boo that is introduced in New Super Mario Bros. 2. It is one of the largest Boos in the Mario series.

It only appears in two different Ghost Houses, which are World 2-Ghost House, and World Flower-Ghost House. In certain areas of a Ghost House, the Boohemoth will pop out of nowhere and chase Mario and/or Luigi. They control the movement of the camera. Just like normal Boos, if Mario or Luigi looks at it, it closes its eyes with its hands and remains still. However, unlike Boos, if Mario or Luigi stare at it for a while when far away from it, it will peek through its hands and slowly sneak up to them up to a dangerously close distance. If Mario/Luigi and the Boohemoth get to the end of the room, standing still at the end of it will result in an insta-death.

The Boohemoth is completely invulnerable, even to the Gold Flower's fireballs, and the Starman.

Unlike the other members of the Boo species, the Boohemoth does not have any fangs (all of its teeth are rectangular), and its eyes are different as well. In addition, they have a kind of chin and bloated cheeks.

Trivia

 * The name is a play on the words "Boo" and "behemoth", which means a great monster.