Gobblegut (Black)

Fire Gobblegut is a secret boss hidden in the Battle Belt Galaxy in Super Mario Galaxy 2. He is fought in the mission, "Snacktime for Gobblegut", and is a harder version of Gobblegut from Bowser Jr.'s Fiery Flotilla.

Appearance
Fire Gobblegut has several major changes to his body from his normal form. First, his skin color changes from a spring green to a lava red. Not only that, but also the fact that his body radiates heat, burning Mario at the touch.

Strategy
The powered-up Gobblegut may be stronger, but he is fought in the same exact manner. This time around though, wherever he bites down on the planet, a pool of lava appears. When only a handful of Bellyache Bulges remain, Gobblegut begins to spit out fireballs at Mario, creating pools of lava where they land.

Trivia

 * Fire Gobblegut is similar to Fiery Dino Piranha, in the sense that both are fiery variations of bosses encountered earlier in their respective games, and are also much harder in general. They both also start spitting fireballs after being hit many times.
 * This boss, along with Bugaboom, are the only bosses in Super Mario Galaxy 2 that can only be accessed by a secret mission.