Galeem

Galeem, also known as the Lord of Light and known in Japan as Kiila, is one of the two main antagonists of Super Smash Bros. Ultimate's World of Light mode, resembling a large sphere of light surrounded by -like wings with shifting colors and patterns on them. Its English name is likely a corruption of the onomatopoeia "gleam," often used in contexts relating to light.

In the opening, it is commanding a horde of Master Hands against the various playable fighters. However, it then absorbs the Hands, turning into a black hole, and uses them to unleash a devastating attack, which only Kirby manages to escape from. Everyone else is hit with snaking yellow beams of light, which imprison them within the eponymous World of Light, before the beams then continue outwards and cover the planet, turning everyone else into spirits.

Galeem has a dark counterpart, known as Dharkon, who plans to engulf the universe in darkness and serves is the primary rival to Galeem. At the end of the game, if players defeat either Galeem or Dharkon separately, they receive a bad ending. If at the end of the game, the amount of darkness and light is equal, players can fight both Galeem and Dharkon in the true boss fight. In the first stage of the true boss fight, in the second part after players avoid Dharkon attacking the vertical stage, players also have to avoid Galeem's attacks. After the players defeat the mode's previous bosses, the player engages in the final phase, where both entities fight each other and the player simultaneously, with them even attacking each other directly if one becomes incapacitated. Once players beat the true boss fight, players can earn legendary spirits of both Galeem and Dharkon. Galeem's spirit has no slots, but comes with a unique ability called "Bane of Darkness", in which damage towards and received from enemies controlled by darkness get doubled in Adventure mode.