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. It controls 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. Because Mario/Luigi cannot go behind it due to its enormous size, getting crushed between the Boohemoth and an obstacle results in losing a life.

The Boohemoth is completely invulnerable, even to Gold Mario'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, it has a kind of chin and bloated cheeks.

Trivia

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