Editing Dark Star Core

|image=[[File:MLBISBJJDarkStarCore.png]]<br>Sprite of the Dark Star Core from ''Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey''

The '''Dark Star Core''' is [[Mario]] and [[Luigi]]'s final boss of ''[[Mario & Luigi: Bowser's Inside Story]]'' and ''[[Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey]]''. It consists of the remains of [[Dark Fawful]] after [[Bowser]] weakened him, combined with the [[Dark Star]] itself. In this form, Fawful's appearance is altered further; he has become a dark blob with red glass eyes along with his usual grin, and the Dark Star is attached to his head via a black antenna. He also gains even greater powers, notably the ability to change his appendages.

Eventually, Mario and Luigi triumph over the Dark Star Core, and Bowser then lands the final blow on Dark Bowser, ultimately defeating him and saving the kingdom. Dark Fawful appears before the Mario Bros. one final time as a dark, battered, unstable blob, and gives one last psychotic smile before exploding, intending to take the pair with him; instead, the explosion negates the effects of the [[Vacuum Shroom]] and expelling Mario, Luigi, Starlow and the [[Toad (species)|Toad]]s from Bowser's body.

During the final battle, Bowser must deal at least 1000 [[Heart Point|HP]] damage to Dark Bowser (1260 in the game's [[Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey|3DS remake]]). Upon this, Dark Bowser will collapse, and Dark Fawful, revealed in Dark Bowser's body, will revive Dark Bowser to his full HP. Upon his revival, Dark Bowser will grow in size, after which his stomach will be able to be targeted. If Bowser punches Dark Bowser in the stomach, Dark Bowser will cough up The Dark Fawful Bug and it will run off screen. Bowser then has to [[Vacuum Block|inhale]] the Dark Fawful Bug but upon beginning to do so, Dark Bowser will attempt to do the same. If Bowser successfully inhales Dark Fawful, Mario and Luigi take over the fight. If Dark Bowser inhales the Dark Fawful Bug, his fight continues on with Bowser. If Bowser does not use his vacuum ability, the Dark Fawful Bug will run back into view and jump back into Dark Bowser. If Dark Bowser is KO'd again before Dark Fawful and the Dark Star Core are inhaled by either party, Dark Fawful will run back onscreen and revive Dark Bowser to his full HP before running away again, with Dark Bowser remaining at normal size.

Inside Bowser, Dark Fawful and the Dark Star Core grow in size. Dark Fawful has two glasses and three appendages. The Dark Star Core is located at the top of Fawful's antenna, which cannot be reached until the Mario Bros. destroy his appendages. If at least one or two of Dark Fawful's glasses are not shattered, he will retract two or one of his appendages. However, the remaining appendage(s) will be left open for attack, allowing the Bros. to get past the appendages even if the glasses are not shattered. His appendages regrow after a few turns if they have been destroyed.

Once all three of his appendages are destroyed, Dark Fawful will fall to the floor and shatter, leaving the Dark Star Core in range of Mario and Luigi's attacks. While shattered, They must deal 1560 damage to the core (2070 in the remake) in a few turns before it revives Fawful, sucks him up, and leaves Bowser's body and returns to Dark Bowser's, essentially requiring the player to repeat the above cycle until sufficient damage has been dealt to the Dark Star Core to result in victory.

[[File:Dark Star Core Explosion.PNG|200px|thumb|The instant the Dark Star Core gets defeated in the original game.]]

Dark Fawful has three attacks if at least one of his appendages remain. In his first attack, he will pick up Mario and Luigi, Mario with his right hand and Luigi with his left, putting the two on separate sides, while the Dark Star Core detaches from its antenna and begins to shoot star rings at the Bros. Fawful will move both of his hands up and down and the Dark Star Core does the same. Depending on both the Bros. and the core's height, the Bros. must either jump or remain still to avoid the star rings, which can be used 3-5 times. The second attack involves the Dark Star Core darkening the arena. Dark Fawful appears in front of the Bros. as a giant head and chases them to the left, while the Core will attempt to ram into the Bros. It will fly across the top screen and a red or green glow will indicate which Bro the Core is aiming for, after which it will fly across the bottom screen into the Brother previously foreshadowed, which can be dodged via jumping. Being hit by this attack twice will cause the Bro. to be crushed by Fawful and take heavy damage. The Core's speed becomes faster every time it attempts to ram, and it does so about 6-9 times before the attack ends and the Bros. are warped back to the main area. The final attack involves Dark Fawful rooting both his hands in front of each Bro, sending energy orbs at random down each arm. The Bros. must use their hammers to destroy each orb before it reaches them, which could result in tripping. Occasionally, a larger orb appears, and if hit by the Bros'. hammers, will be launched back at Fawful's arm, putting it out of commission until the attack ends.

[[File:Darkfawfulexplode.png|180px|thumb|Dark Fawful about to explode.]]

After Dark Fawful shatters, the Dark Star Core will have two new attacks. For the first attack, it will charge up a deadly laser that deals major damage, similar to the previous battle with the [[Dark Star]] in the Airway. The Bros. must grab Starlow to avoid the attack, only letting go of her once it has finished. For its second attack, the Dark Star Core creates a long energy spear and spins it above the Bros. heads either clockwise or counterclockwise. After spinning the arrow for a while, it will drop it on the ground, forcing the Bros. to jump each time it passes under their feet. The Core may trick the Bros. into jumping early by lowering the spear slightly before raising it up again. If the Bros. do not sustain too much damage, the Core follows up by conjuring a larger arrow and launching it at a Bro. It can be telegraphed by its shadow, and countered back at the Core with the hammer.

 

The 3DS remake makes a few visual and technical changes to the battle with the Core. If the Bros. try to attack Dark Fawful's legs before destroying his glasses, he will now retract all of his legs and cling to the ceiling, making it impossible to damage his legs without destroying the glasses. The speed of the Dark Star Core itself during its ramming attack has also been generally lowered, and the spear attack while Dark Fawful is shattered has been drastically altered. The Dark Star Core instead summons multiple black orbs of different sizes that circle around Dark Fawful's body. the Bros. must jump over the orbs as they pass, although some can fly over the Bros. to damage them if they jump. If one of the Bros. is hit by an orb, that orb will shatter. After this, the Dark Star Core will suck in any remaining orbs to create an arrow to fire it at a Bro, which, like the original game, can be countered with the hammer. Like all bosses in the remake, The Core will gain the [[Fury]] status when its HP drops below half.

 

When the Dark Star Core is damaged enough, it will be defeated along with Dark Fawful. In the 3DS remake, it will have its own unique defeat animation in which a massive explosion will occur. This will cause Dark Bowser to become unstable.

{{:Mario & Luigi: Bowser's Inside Story bestiary|transcludesection=Dark Star Core|align=horizontal|}}

{{:Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey bestiary|transcludesection=Glasses|image=[[File:Dark Star Core head sprite M&LBIS+BJJ.gif]]|align=horizontal|}}

|FreA=Lunette

|FreAM=Glass

|FreE=Verre

|FreEM=Glass

|FreE=Patte

|FreEM=Foot

|SpaEM=From "núcleo" (core) and "Grácovitz" ([[Fawful]]'s European Spanish name)

|FreA=Noyau Étoile obscure

|FreAM=Dark Star Core

|FreE=Astre Noir (noyau)

|FreEM=Dark Star (core)

|GerM=From "Krankfried" ([[Fawful]]) and "kern" (core)

*When one of Fawful's eyes is damaged, the Dark Star Core closes one of its eyes as well, showing that both Fawful and the Dark Star feel pain at the same time.