Dharkon

Dharkon (, Darz) is one of the two main antagonists of Super Smash Bros. Ultimate's Adventure Mode: World of Light. He is described as the "Embodiment of Chaos and Darkness" in the World of Light. His goal, similar to that of his light counterpart Galeem, is to corrupt the universe in his own image.

Role in World of Light
After Galeem's first defeat, Dharkon appears from a portal in the sky, commanding an army of Crazy Hands. After the Crazy Hands briefly fight Galeem's Master Hands and win, Galeem proceeds to flee. Dharkon proceeds to take control of the remaining captive fighters and Spirits and creates a world of darkness.

Dharkon is summoned following the defeat of Ganon, Marx, and Dracula in the Dark Realm. Following Dharkon's first defeat, he proceeds to flee into the final world, with Galeem following soon after. In the final world, Galeem and Dharkon wage war against each other, but are also seeking to destroy the fighters.

If only Galeem is defeated during the Final Battle, Dharkon destroys Galeem's army, enchains and impales him and engulfs the fighters and the world in darkness. Mario also is shown collapsing, seemingly dead, resulting in one of two bad endings.

If only Dharkon is defeated during the Final Battle, Galeem turns into a black hole again and engulfs the fighters in a bright light. Galeem takes over the entire universe again.

If both Galeem and Dharkon are confronted in the final stage, following Master Hand and Crazy Hand being freed from control and conquering the battlefield, the pair continue to battle each other along with their puppet fighters and bosses before turning their attention to the fighters in a three-way battle. Once both Dharkon and Galeem are finally defeated, they fall into the sea and explode, freeing all the spirits from their control.

Moveset
Dharkon's eye is the only place he can be damaged. He can be stunned, which drops the eye on the stage for several seconds. After his health falls below half, Dharkon's sclera color will shift to dark violet.

Note that many attacks' characteristics, such as a number of projectiles fired, vary depending on both Dharkon's health, which battles it is and the difficulty of World of Light. Also, certain attacks are never used in certain battles.

During the final battle with Galeem and Dharkon, both bosses will target both the player and each other, and are capable of dealing damage to each other; if one is stunned, the other will seize the opportunity to take a potshot. Regardless, only the player can deal the final blow.

Spirit
Dharkon's spirit can be obtained after beating both Galeem and Dharkon in World of Light.

Trivia

 * Dharkon's theme is mostly comprised of the fourth verse of Lifelight, the main theme of Super Smash Bros. Ultimate.
 * Dharkon's appearance of being an organic mass of tentacles resembles, a being featured in the Cthulhu mythos. Along with his single slitted eye, the boss could also be compared to ' and  from the Cthulhu mythos.
 * Dharkon's color scheme also bears resemblance to the from The Legend of Zelda: Breath of the Wild.
 * The Rage Blaster weapon bears a striking resemblance to Dharkon's tentacles.
 * Interestingly, Dharkon's eye always follows the fighter during his battle. This makes him the only boss in the Smash Bros. series with this distinction, as even his light-themed counterpart Galeem (apparently) does not track the player.
 * Dharkon appears in the 's reveal trailer, where and the four incarnations of the Hero battle his puppet fighters.
 * Dharkon and Galeem are the only two bosses not to appear in Classic Mode as bosses, since they are the antagonists of the World of Light.

Lúgubra