Big Boo (Paper Mario series)

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Atomic Boo.

Atomic Boo is a Big Boo made up of exactly two hundred different Boos. The Atomic Boo is an optional mini-boss in Paper Mario: The Thousand-Year Door. To fight this boss, Mario must go to the Creepy Steeple after freeing the Boos in Chapter 4 and agreeing to be nice to them, after which all the Boos will come out and swarm him. If Mario knocks the Boos away twice with the Super Hammer by using the Spin Attack, the Boos will combine together to make the Atomic Boo. Atomic Boo attacks by flinging Boos at Mario, charging up a powerful glare attack, hiding his face and becoming invisible like regular Boos, floating over and falling onto both Mario and his partner, and inflicting Mario with status ailments such as confusion and paralysis. Once Atomic Boo is defeated, he will relinquish his Lucky Start badge to Mario and the Boos will stop their swarming and appear as normal enemies.

In Super Paper Mario, a considerably weaker Atomic Boo appears in Merlee's Mansion; this Atomic Boo will use attempt to attack the player by charging at them while the are facing the direction opposite of them and will turn intangible and shy away if the player faces it.

Also in Super Paper Mario, Atomic Boos will occasionally appear in the minigame Mansion Patrol; though slower than regular Boos, Atomic Boos take several hits to defeat, instead a single one.

Stats and Tattle Information

Paper Mario: The Thousand-Year Door

• HP: 40
• Attack: 4
• Defense: 0
• Location: Creepy Steeple
• Tattle Number: 72
• Tattle Log: A massive creature made up of countless Boos. It attacks by breaking apart and sending out hundreds of Boos.
• Tattle: That's an Atomic Boo. It's a giant Boo made up of a ton of smaller Boos. This thing will try to smoosh us. It can also split up and send hundreds of Boos at us. And, when he attacks, we might get so scared that we get confused or can't move. I sure wouldn't want to see this thing standing behind me in the middle of the night... Creeeeeepy...

Super Paper Mario

• HP: 10
• Attack: 2
• Defense: 0
• Location: Merlee's Mansion
• Catch Card Number:
• Tattle: That's an Atomic Boo. That is one enormous Boo... Max HP is 10. Attack is 2. It will follow you until you turn around, then it just disappears... It has a lot of HP, so you may want to use an item while your back is turned... Some say this Boo is a huge massive ball of many smaller Boos...

Trivia

• Oddly, one Boo, known as the Creepy Steeple Boo, sends an e-mail to Mario thanking him for freeing his friends. It is unknown if he was one of the Boos that formed Atomic Boo.

• A purple variant of Atomic Boo, called Dark Atomic Boo, was found in the game's coding, but cannot be fought. Presumably it would serve as a late-game mini-boss, perhaps in Poshley Sanctum, where the smaller Dark Boos can be found in abundance. It's reasonable to assume that Dark Atomic Boo would have used more powerful versions of Atomic Boo's attacks.

• Atomic Boo is similar to Boolossus from the game Luigi's Mansion, and Bigger Boo from Super Mario World 2: Yoshi's Island, being that both are made out of many normal Boos. Boolusses maybe a type of Atomic Boo.