Bowser in the Broken Realm

Not to be confused with Bowser in the Randomized Realm, an anomalous Bowser level with a similar name and appearance found on Floor 2B of Princess Peach's Castle.

Bowser in the Broken Realm is an anomalous Bowser level found in some personalized copies of Super Mario 64, most commonly found in His Domain. It has been described as appearing in a large pink void made up of several pieces of building resembling Princess Peach's Castle. This level reportedly has a unique ending upon completion, making it an anomalous equivalent to Bowser in the Sky. This level is also unique for reportedly having an intermediary area before the boss fight, the Eternal Star in some copies and even connections to the Eternal Fort according to some claims.

Description
Bowser in the Broken Realm typically takes a similar appearance to Bowser in the Randomized Realm with a much more structured design, usually only using pieces of Princess Peach's Castle instead of other levels, though reports of assets from other areas have been reported. It also reportedly has several enemies from all over the game, even some that usually don't appear in Bowser levels such as Piranha Plants due to the grass from the castle that can appear. It also reportedly has several side areas the player can easily miss that contain red coins for this level's Power Star.

There is a supposed intermediary area that can appear before the fight with Bowser at the end unlike any other Bowser level, reportedly appearing as a much more complete castle area resembling the first floor, with several doors that usually lead nowhere, softlock the game, or can lead to some other strange areas reported, such as a unique courtyard area that can supposedly lead to the Eternal Fort, as there is a door commonly reported somewhere in this area that tells the player they are not worthy, a staple of the Eternal Fort.

Upon defeating Bowser, there is reportedly a sequence after him that usually leads to this level's ending if it isn't immediately after winning the battle, such as the area collapsing and you have to run to a specific area, or a unique cutscene that ties into a unique story of some kind, though this story is usually inconsistent besides for the idea of Bowser deconstructing Princess Peach's Castle for His Domain here this level can reportedly be found.