Dragon Slayer Magic (滅竜魔法 Metsuryuu Mahou): As one of the first humans who entered the Dragon Civil War, Madara was also among the first Dragon Slayers brought into existence. Over time, however, as he slayed many Dragons, he himself was, eventually, turned into a Dragon due to the extensive overuse of his Lost Magic. When Madara employs his Dragon Slayer Magic, it grants him the ability to reap the very souls of Dragons, allowing him to become even more powerful.
Dragon's Roar - Like all Dragons and Dragon Slayers, Madara can perform a Dragon's Roar, incorporating his respective element into a massive breath attack. While, as mentioned, which element Madara employs is currently unknown, said blast, while he was a Dragon, was potent enough to "completely eradicate" the entirety of an island and imprint a giant crater into the ocean.
Shape-Shifting: Madara and the Clan Dragonborn, contrary to the legends surrounding them, did not entirely became Dragon and have retained the ability to enter and exit their extremely powerful Dragon Forms at will.
Flight: As a Dragon, Madara possesses the ability to fly, using his large wings to travel great distances, maneuver high up in the air, and perform aerial assaults on those below him.
Augmented Durability: Madara, while a Dragon, is capable of shrugging off attacks from extremely powerful Mages, whereas all their Magics having absolutely no effect on the Black Dragon. Later on, it is shown how even other Dragons have high difficulty harming Madara in any noteworthy way, him taking the full force of powerful dragons’ attacks and emerging unscathed as if nothing happened.
Augmented Strength: Given his immense size, Madara, in Dragon form, is easily capable of reducing a substantially sized area to rubble by simply landing on top of it. Truly attesting to the form's immense brutish strength, Madara can engaged in a head-on physical confrontation with other dragons and still easily gain the upper hand.
Dragon Supremacy Magic (操竜魔法 Souryuu Mahou): Dragon Supremacy Magic allows the user to dominate the will of a Dragon, effectively making them their subordinate, a remarkable feat, given that most Dragons think of humans as little more than food. However, a Dragon can, with a strong enough conviction, overcome the effects of this Magic, acting, once again, of their own free will. Also, if large amounts of Dragons are present, the user will have difficulty maintaining their control over them.