Master Core

The Swarm is a boss in Super Smash Bros. for Nintendo 3DS. He is the Final Boss of the game's Classic Mode when it is played on 7.0 intensity or higher. Once the player brings Master Hand and Crazy Hand's health to a certain point, Master Hand transforms into The Swarm, a black monster with five different forms that breaks out of Master Hand's glove. It starts off in a humanoid state where it uses its hands to attack and lift the stage, then it transforms into a scorpion of sorts capable of powerful attacks. Afterward, it will become a set of four blades capable of rapid combos, which will then transform into a shadowy clone of the player's current character. If all four forms are taken out, the blackness will dissipate, revealing its true form: a rainbow-colored orb which must be knocked out of the blast-zone. However, if it's not knocked out, it will blast the player's character off the stage with its wave attack, an instant K.O. move.

Trivia

 * The Swarm's humanoid design resembles a Shaydas, but without the blades and only having one head.
 * The Swarm's wave attack is possibly a resemblance of Tabuu's Off Wave attack.