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). Similar 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 and the center of his belly and the tips of his shell spikes glow yellow and red. 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 also has more defined pectoral muscles, a trait shared by his Super Smash Bros. appearances. It was later revealed the form was caused by Bowser Jr. painting his dad as a prank, which massively backfired due to Bowser being left outraged by the resulting prank.

Fury Bowser has amplified versions of his fire breath attacks. He can rain meteors across entire islands, and breathe long beams of fire at his targets. 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.

He is seen terrorizing Lake Lapcat, and Mario, with assistance from Bowser Jr., works to take down Fury Bowser and turn him back to normal by using the power of the Giga Bell.

Typically, Fury Bowser is found sleeping in the middle of Lake Lapcat, hiding his whole body inside the Fury Sun (a spiky blob of goop 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. When he awakens, he goes on a rampage at intervals of roughly six minutes, but using the Bowser amiibo in the game can cause him to appear at the player's command. After a while, or if the player collects a Cat Shine, Fury Bowser will stop attacking and go back into his slumber.

After obtaining the Giga Bell and becoming Giga Cat Mario, a fight will occur. Bowser will do a few attacks: he will either use his fire breath, jump up and try to ground pound Mario, causing a fire shockwave to come out upon landing, or dig into the ground and cause spikes to rain out. Mario can damage Bowser by claw swiping him or ground pounding when Bowser is vulnerable, which is when he is on his back in his shell. A health bar in red will be above Bowser, showing his health. This will deplete when he is hit or when he is stunned by a Cat Shine Mario collects when not giant. It takes a total of six Giga ground pounds to deplete his health bar on the first stage. After enough damage, Bowser will be heavily knocked back and fall to the ground, seemingly unconscious. Two different cutscenes will play after the fight commences depending on the health: if there is health left when the cutscene plays, Bowser will get back up, shake his head, and then leave. If his health reaches zero, he will glow brighter and brighter until a massive explosion occurs. Bowser, in his shell, would fly up from the blast and hit the water, before sinking back down. This reveals the next island. On the final fight when he reaches zero, he will expel the black paint before glowing, and then be engulfed in a bigger explosion. Here, he will rise up again, retaining his giant size and glowing eyes as he traps all three of the Giga Bells in a large crystal, as the final phase begins.

While Fury Bowser is awake, all kittens and calico cat parents turn into dark versions of themselves and attack Mario.

As the game progresses, Fury Bowser's behavior, and the color of the sky, changes depending on how many times he is beaten and on the island. On the first time he is beaten on all the Islands, the sky is black, and Bowser stays for a few minutes, or until a shine is collected. During the second time he is beaten on the second and third islands, the sky is a slight red, and Bowser stays much longer, usually needing a shine or lighthouse to have him retreat quickly. On the third time on the third island, the sky is much redder, 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.

Bowser starts to roll on the second island, usually on his side towards Mario. On island three, he shoots spikes individually, throw soccer bombs, fire a ring of fireballs, and ground pound multiple times. The spikes he shoots can be picked up and thrown at him to stun him.

After Fury Bowser is defeated the final time, he vomits out all of his goop before sinking below the water, only for him to reemerge as a slightly smaller but still enormous version of himself, having normal Bowser's proportions. Still out of control, he holds the three Giga Bells hostage and encases them in a magic crystal to prevent Mario from using them against him. Only after Mario and Plessie defeat him in this state does Bowser finally return to normal.

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 (due to them and the rest of the island being cleared of it after beating the campaign) allowing the player to fight Bowser whenever he appears.

By collecting all 100 Cat Shines in the Bowser's Fury campaign, Fury Bowser's hair, spikes and the glowing spot on his chest will become a shiny white color; in addition, Fury Bowser's health bar will become blue and always starts at max health despite any previous damage done before the 100th Cat Shine is collected, though this is merely an aesthetic change that does not change any of Fury Bowser's abilities.

After defeating Fury Bowser with 100 Cat Shines, the Fury Sun will disappear, and Fury Bowser will no longer attack and will permanently disappear.

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.