Carbon Wraith

The Carbon Wraith is the true final boss of Pikmin: Spark. It is an indescribable black amorphous mass that assimilated the data of the Jirite's drilling platform which contained data and DNA on all creatures discovered on PNF-404. Using the knowledge it determines that life is cruel and decides to destroy the planet. It is found in its area called Dark Recess. This boss consists of several phases that require the use and planning of all Pikmin available.

Phase 1: Carbon Mass
The Carbon Mass is similar in appearance to the Plasm Wraith, although it is more geometrical in appearance. It has a physical shield at the start of the battle and to break if you need to attack the cores it scatters about. These cores are created by the Carbon Mass scattering carbon fluid all over the place. This fluid is one of several colors with each color determining the properties of the carbon launched. Each carbon puddle also has two cores that deal damage to the boss's shield that can only be defeated by two different Pikmin types:

Red Carbon melts into fire releasing toxic smog meaning only Red Pikmin and White Pikmin can deal with it.

Blue Carbon bubble into a large sphere of water that launch ice crystals meaning you need both Blue Pikmin and Hairy Pikmin.

Yellow Carbon magnetizes Pikmin and attracts them into an electric node made of crystal, which must be dealt with Yellow Pikmin and Rock Pikmin.

Purple Carbon flies up and launches explosive motors meaning Winged Pikmin and Goo Pikmin can defeat it.

When each core is destroyed the Carbon Mass takes damage to its shield. When fully depleted the Carbon Wraith launched a series of glowing plasma balls from its mouth creating glowing pink cores. These cores spawn replicas of the various enemies you face in the game and by breaking them you deal damage to the Carbon Mass's physical health. The more damage it takes the more tougher the enemies become. When fully depleted the Carbon Mass slinks off requiring the party to chase after it.

Phase 2: Carbon Roller
The Carbon Roller takes a form similar to the Waterwraith but is much more eldritch in appearance with more squid-like features. The Carbon Roller attacks similar to the wraith as it chases the team in a maze but is much more reckless, running into walls that drop boulders in the process for example. The Carbon Roller is completely invulnerable in its black-colored front. Sneaking around the maze and attacking its backside can you damage it. However, after a while, the Roller will morph and teleport in front of you continuing the chase. After some damage, the Carbon Roller will seep into the floor requiring the continuation of the chase.

Phase 3: Carbon Heart
The Carbon Heart is the final phase of the boss in normal mode. The boss scatters strange bullet-like projectiles from its heart-like mass. These bullets need to be touched by a Pikmin of a specific color as they will reflect the bullets back at the heart to break its physical shield. Then after that you need to attack the heart by swarming it. In between all that it will summon a squad of carbon replicas to attack you and if left alone will heal the physical shield it has. Occasionally it will create an unavailable beam that damages a captain of a certain color and you need to switch to a different captain to avoid it.

Phase 4: Carbon Soul
The true final phase of the game is available only under Ultra-Spicy Mode, this form is ghost-like and attacks the party head-on. The Carbon Soul attacks by splitting into many smaller ghosts that mimics your current army but with twice the power. To avoid being massacred you need to trick the army by leading them to hazards that will instantly kill them. After a few of the ghosts are destroyed a core appears which much be destroyed. After that is a repeat of the bullet attack from the Carbon Heart but much more chaotic. Then after all that you have to defeat the soul of the boss before it becomes intangible meaning you have to repeat the process all over again.

After all that is completed no matter the difficulty the Carbon Wraith dissipates revealing worth of sparklium via a strange gem it creates upon death. But suddenly the remains of the wraith jet out into the sky as a mist. However, nothing else happens and the crew collects the crystal completing the game.