Bomb Boo

A Bomb Boo is a type of Boo that has made an appearance in Super Mario Galaxy. They're an explosive, charcoal black-colored Boo. They have made an appearance in Ghostly Galaxy in the missions Beware of Bouldergeist and Bouldergeist Daredevil Run. Bomb Boos only appear when Bouldergeist throws a small black stone and when the stone breaks, a Bomb Boo appears, that the player can use to attack the boss. They also appear when Bouldergeist loses his rock body(by getting hit by 3 Bomb Boos), and floats lazily around having Bomb Boos appear from its trail which the player can use to hit the glowing red, dangling thing to make Bouldergeist take damage.

Using a Star Spin near one will cause Mario to grab it by its tongue and start swing it around. If it hits something or after a certain amount of time it will explode, injuring Mario or Luigi.