Dark Star

"It was not benevolent. It was a frightful star that hid a great evil."

- Princess Peach

The Dark Star is an artifact featuring prominently in Mario & Luigi: Bowser's Inside Story. Long before the time of the game, it was discovered by Toad archaeologists. It attacked the kingdom, and was sealed away by the Star Sprites. It was said that if someone evil broke the seal on the Dark Star and allowed it to attack the kingdom once again, the evil entity would receive enormous power.

''Mario & Luigi: Bowser's Inside Story
During the events of Bowser's Inside Story, the Dark Star was stolen by Fawful in order to fulfill his plans. He uses its power to barricade the front door to Peach's Castle allowing him to use it as a stronghold during the game. Mario and Luigi eventually use the Miracle Cure to destroy the barrier. He also kidnapped Princess Peach in order to break its seal.

When Bowser confronts Fawful and Midbus near the end of the game, the Dark Star escapes from the machine that Fawful has been using to drain its power. While Bowser is distracted fighting Blizzard Midbus, Fawful absorbs some of the Dark Star's power and is converted to Dark Fawful. He flies off in search of the missing star. However, while he is gone, the Dark Star returns and invades Bowser's body. Thus, Mario and Luigi venture to the final unexplored area of Bowser's body, Airway. Here, they discover the Dark Star absorbing pieces of Bowser's DNA. They attempt to capture it several times, but each time it escapes using one of Bowser's powers: punching, breathing fire, and the body slam. Starlow theorizes that it is somehow incorporating Bowser's DNA into its own body, apparently interested in Bowser's massive strength and other abilities.

Eventually, the Mario bros. confront Dark Star at the very back of the Airway. They attempt to destroy it, but it simply escapes from Bowser's body. Outside, it transforms into an apparition of Dark Bowser and escapes, freeing Bowser from the room he was trapped in in the process.

Later, when Bowser defeats Dark Fawful, he becomes a small blob of dark power, the Dark Fawful Bug, and escapes. The still incomplete Dark Bowser absorbs Fawful and uses the power he took to complete his body.

The Dark Star's final appearance is during the final battle. After Bowser deals critical damage to Dark Bowser, what remains of Fawful heals him fully and causes him to double in size. At this point, Bowser attacks Dark Bowser's belly, causing him to expel Dark Fawful. Bowser absorbs Dark Fawful for the Mario bros. to handle. Here, he transforms into a giant insectoid mass of dark power, still with his manic grin and now crimson eyes. His only weakness is the Dark Star Core, which sits on an antenna high above his head. As with the final bosses in the previous two games, Mario and Luigi must progressively disable the different parts of Dark Fawful before attacking this weakness. It is likely that it still has a distinct intelligence from Fawful's, since he is visibly displeased whenever it decides to flee. It is eventually destroyed along with Dark Bowser.

Battle
In battle, the Dark Star can not usually be damaged. To expose its vulnerability, the Marios must destroy the Dark Satellmites that surround it. With sufficient damage, the Dark Satellmites will use a Kamikaze attack that consists of throwing a bomb at one Mario brother, and throwing their own body at the other. Ordinarily, both will miss, but either brother can attack the projectile launched at him. If the bomb is attacked, it will explode, doing damage to either Mario or Luigi. If the satellmite is attacked, it will be knocked flying into the Dark Star. After being hit in such a way twice, the Star will become vulnerable and immobile for a turn.

Attacks
One of the Dark Star's attacks consists of it splitting into five as a thick fog fills the battlefield. Each Dark Star then flies slowly at Mario or Luigi, vanishing into the fog as it draws near. The Marios must counter this attack by using their hammers on the hidden Stars.

In another attack, the Dark Star will shine a bright light at the Marios, causing their shadows to come to life. The shadows will then move in a circle around the Dark Star, which will attack them with beams of electricity. The Mario Bros. must jump to avoid the electricity, as any damage done to the shadows will hurt the real Mario Bros. as well.

The Dark Star may also send red and green energy balls into the air. It will then fly through these balls in order, sending them at the correspondingly colored brother. They may be countered using jump.

When the Dark Star has been immobilized, whoever attacks it, it will shoot out a laser at the bro. who gave the order to attack.

After receiving sufficient damage, the Dark Star will use a laser attack that fills up the entire touch screen. Starlow will appear just before this attack activates, suggesting that Mario and Luigi grab on to her. When they do so, Starlow will fly up in the air (top screen) therefore avoiding the attack. After the attack is through, the Dark Star will look up and attempt to ram into the bros. The Mario bros. must release their hold on Starlow to avoid making contact with the Dark Star. This attack deals massive damage and may also inflict the Poison status.

Just before it is defeated, the Dark Star will use a vacuum attack on both Mario and Luigi. This must be countered by pressing A and B repeatedly or the brothers will take massive damage. The Dark Star will then be defeated.

Dark Star X
Dark Star X is the sixth boss class located in the Gauntlet, which is inside the Challenge Node It is the second-strongest boss in the game (after Bowser X). It is recommended for the player to be level 40 at minimum to challenge it. To start, 2500 coins must be paid to battle Dark Star X. The bros. have up to 12 turns to destroy Dark Star X. If the player defeats it, he or she will unlock Class 7, where they will fight all previous classes, including the Dark Star X, and Bowser X.

During the battle, Dark Star X is similar to the original Dark Star, just tougher and with a red and black color scheme. It has more health, more defense, and more attack power than the original, and its attacks are more challenging to dodge. If the bros die or run out of turns, the battle must be restarted.

Some changes are that the Dark Satellmites X's energy beams travel and Kamikaze attacks move faster, just as the Dark Star's clones do; there are also seven clones instead of the original five. When the bros' shadows come to life, they automatically split in two, something the original Star only did when it had been weakened. Finally, when the Dark Star is vulnerable to attack, it uses its laser strike much more often.

Trivia

 * Dark Star's beam attack is similar to R.O.B's Final Smash.
 * The Dark Star is the only final boss in the Mario & Luigi series that did not possess Bowser. However, it did take on a form resembling Bowser.