Lucemon

ルーチェモン

Lucemon was a Digimon who believed that others were incapable of independent thought, and that the world would improve if he held absolute power and made all decisions. He appeared during the war between Human-type and Beast-type Digimon in the ancient past of the Digimon Frontier timeline. Lucemon stopped the war and established rules for a peaceful society in which he served as the ultimate sovereign. However, he was corrupted by his own power and became oppressive toward all other Digimon.
His power rendered him unbeatable until the first Legendary Warriors appeared and sealed him inside the Dark Area. Governance of the Digital World was transferred to the three Celestial Digimon: Ophanimon, Seraphimon, and Cherubimon. Lucemon corrupted Cherubimon, compelling him, and later the Royal Knights, to collect the data required for his revival. They succeeded, and Lucemon was reawakened. Although he never fought on screen in his original form, while imprisoned he sent out a burst of power that defeated a relatively unhurt EmperorGreymon and MagnaGarurumon, blasting them away with his Grand Cross attack when he appeared on the moon.
Lucemon Chaos Mode is Lucemon's ultimate form. In this form, Lucemon appears as an adult-like figure wearing white-angel/black-demon 2-toned attire, representing his ability to combine the powers of light and darkness.