The Creepy Steeple is the home of many Boos and the Atomic Boo in Paper Mario: The Thousand-Year Door, but the most important resident is Doopliss, who is even depicted in the stained-glass window in the Steeple's foyer. This location is where Doopliss steals Mario's identity and name, temporarily making him a shadow. After being defeated twice by the real Mario in Chapter 4, Doopliss abandoned Creepy Steeple and joined the Shadow Sirens (in place of Vivian, who had joined Mario).
There is a Boo called The Creepy Steeple Boo who Mario has to interact with at first. Afterwards, Mario must use the stairs behind the main room to get to the balcony, where Doopliss resides. After defeating Doopliss, Mario's body is stolen and he acts as a shadow. With Vivian's help, he gets to know Doopliss's name from the Parrot in a room deep below the steeple as well as the letter "p" required to spell it. With these two things, Mario will be able to confront Doopliss at the balcony again, defeating him and getting the fourth Crystal Star.
The Creepy Steeple is located beyond Twilight Town at the end of the Twilight Trail. There is a secret entrance through the well in front of the Steeple. There is also a secret path in the northern corridor of the building which leads to a golden tree behind the Steeple. This golden tree is the only source of Golden Leaves, which are useful items for recipes.
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