Fury Bowser

Fury Bowser is a form that Bowser takes in the Bowser's Fury mode of Super Mario 3D World + Bowser's Fury. In this form, Bowser becomes a gargantuan , being one of the largest physical forms he has ever taken (along with Giant Bowser). Similarly to Black Bowser from Paper Mario: Color Splash, Bowser becomes corrupted by black paint, which causes his skin to become entirely black in color, complete with glowing yellow eyes without pupils, though in contrast, his hair glows a bright red while the center of his carapace and the tips of his shell spikes glow yellow and red. Once 100% completion of Bowser's Fury has been achieved (by collecting all one hundred Cat Shines and then defeating the final boss again), the red and yellow parts of Fury Bowser are changed to instead be white. In comparison to his normal self, his body is much larger than his head, his tail is somewhat longer, he has more spikes on his arm bands, and he has more defined pectoral muscles; the lattermost trait is shared by Bowser's appearances in the Super Smash Bros. series. It is implied by Bowser Jr.'s paintings in the credits and when Mario first encounters him that the form was unintentionally caused by Bowser Jr. painting his father black and angering him.

Typically, Fury Bowser is found sleeping in the middle of Lake Lapcat, hiding his whole body inside the Fury Sun (a spiky blob of goo that resembles Bowser's Spike Ball form in Mario & Luigi: Bowser's Inside Story and the Super Mario Galaxy games, as well as the spiky shells he throws in his Super Mario Odyssey battles), which slowly rises from the ground. He usually awakens at intervals of roughly six minutes, but using the Bowser amiibo in the game causes him to appear instantly. Just before he wakes up, the music changes and a storm begins, which continues when he is awake; additionally, while he is awake, the day aesthetically changes to night. Once awake, he jumps to a position near Mario and goes on a rampage. When this occurs, he launches many spike-shaped platforms into walls and floors, some of which have Mushroom Trampolines on them. Large, gold blocks that resemble Moon Rocks and usually have ? Blocks containing coins above them also appear. During Fury Bowser's rampage, he breathes large beams of fire at Mario, which can destroy the aforementioned gold blocks (which leave behind coins) and spike-shaped platforms (these are also destroyed when Fury Bowser stops attacking). Additionally, this fire is the only thing capable of destroying Fury Blocks; to show this, the Bowser emblems on the blocks glow red during the rampage. Meteors fall around the entirety of the lake throughout the rampage and leave behind small circles of lava where they land. All kittens and calico cat parents on the lake turn into Fury Cats for the duration of the rampage. After a while, or if the player collects a Cat Shine, Fury Bowser stops attacking and goes back into his slumber. Compared to Bowser's normal roar and even Dry Bowser's roar, Fury Bowser's roar is more realistic-sounding, sounding deeper and almost demonic, and has a reverberating echo effect to it.

If Mario has collected enough Cat Shines to awaken the Giga Bells, then they will become active while Fury Bowser is awake, allowing Mario to obtain them. After Mario obtains a Giga Bell and becomes Giga Cat Mario, a boss battle against Fury Bowser occurs; this happens multiple times throughout the game. Bowser uses several different attacks during these fights. He may use his fire breath, jump up and try to crush Mario, or dig into the ground and cause spikes to rain out. In later fights, he gains additional attacks such as breathing a ring of huge fireballs, summoning giant Kick Bombs (which can be launched back at him to make him flip over and enter his shell, leaving him vulnerable to a Ground Pound before he recovers), and entering his shell before rolling towards Mario on his side. If Bowser attempts to crush Mario, then he will enter his shell and aim at Mario, with a red circle appearing in the place he is set to land; once he does land, a shockwave of fire emerges from him. Mario can then Ground Pound his vulnerable carapace before he recovers to damage him. In later battles, Bowser repeats this attack multiple times in quick succession before he becomes vulnerable. If Bowser chooses to drop spikes, which he usually does at the start of later battles, then red markers show where they will land on the ground. After they land, Mario can pick them up and throw them, and if one makes contact with Bowser, then he will enter his shell and flip onto his back, making him temporarily vulnerable to Ground Pounds. Mario can alternatively damage Bowser by claw swiping him, though this deals less damage than Ground Pounding him when he is vulnerable does. A health bar in red (blue after 100% completion is achieved) is above Bowser and shows how much remaining health he has; it takes a total of six Ground Pounds to deplete his health bar on the first stage. Though battling him as Giga Cat Mario is the most effective way to deplete his health, a small amount of it will also deplete when Mario collects a Cat Shine and lights up a lighthouse with it while Fury Bowser is active. However, defeating him without becoming Giga Cat Mario is not possible since lighthouses never deal enough damage to bring his health below one. After 100% completion has been achieved, Fury Bowser always starts battles on maximum health. After enough of Bowser's health bar has been depleted, Bowser will be heavily knocked back and fall to the ground, seemingly unconscious. What happens after this depends on whether his health was fully depleted or not; if it was not, then Bowser will get back up, shake his head, and return to the Fury Sun, while if it was, then he will glow brighter and brighter until a massive explosion occurs, causing him to fly upwards in his shell from the blast and hit the water, before sinking back down. This reveals the next islands. When Bowser's health reaches zero in the final Giga Cat Mario fight, he expels the black paint from his mouth before glowing, and then is engulfed in an even larger explosion. Bowser Jr. then approaches him, at which point he rises back up with his regular appearance, albeit much larger (slightly smaller than Fury Bowser) and with glowing white eyes that lack pupils, causing Bowser Jr. to flee. Bowser then traps all three of the Giga Bells in a large crystal ball, and the final boss battle begins.

Later in the game, Fury Bowser's behavior and the color of the sky both change, depending on how many times he is beaten by Giga Cat Mario. Initially, the sky is black, and Bowser stays for a few minutes, or until a Cat Shine is collected. After the second time he is beaten, the sky is a slight red, and Bowser stays much longer. After the third time, the sky is much more red, and Bowser stays until another Cat Shine is collected, as he no longer retreats on his own. When there are only three Cat Shines left until the final battle, Fury Bowser cannot be sent into slumber, forcing the player to collect the remaining three while he is still attacking. If Bowser's Fury is played after it has been cleared, Fury Bowser will be on either the first or second stage of attack, and the Giga Bells always have no black paint on them, allowing the player to fight Bowser whenever he appears.

Trivia

 * Fury Bowser bears a resemblance to Bowser's appearance when using his Mega Strike in Mario Strikers Charged.
 * Fury Bowser and the material in his surroundings resemble, a typically dark fluid that can form spikes when influenced by a magnetic field.
 * Until the third phase, each Cat Shine that is collected while Fury Bowser is active will do a little damage. However, it is impossible to defeat Fury Bowser by only collecting Cat Shines due to the damage stopping once he reaches one point of health, meaning the Giga Bell is required for the finishing blow.