I always just assumed he made it black so that we could see it
Unlike Observation Haki, which couldn't be detected with the naked eye, Armament Haki, which coats the body or weapons, cannot be hidden because the coated area turns black.
"They are using magic. Look closely, they are fortifying their weapons, teleporting, mixing attacks with spells. Oh, Doom just made the shaft of Odin's spear slippery. Damn, that sounds wrong," Savant chuckled.
Cypher saw that Doom's body was recreated organ by organ right before him. Finally, a naked Doom stood in the place where the mass of flesh used to be. Doom flexed his muscles a bit, checked his body, and waved his hand. With his wave, some glowing runes appeared and transformed random matter into fabric that created clothing over Doom's body.
It wasn't just the people, the culture in development with its artisans and teachers. Jon had all his vaults filled with gold, but gold had no value here; no one cared about it. Jon was storing gold taken from the mines of miners and putting it into forms to be identified as dragons for use in the future of his plans. People looked at Arya as if she were stupid when she said that Jon let her jump and swim in piles and piles of gold in his largest vault.
Game of Thrones: The Legend of Jon Arctic – ASOIAF/GOT GOT
Jon dedicated six hours daily to studying the past, immersing himself in the visions the tree provided. He witnessed the construction of King's Landing by Maegor the Cruel and his engineers. He observed how Braavos was raised from the waters and how Brandon the Builder erected the Wall with the help of thousands of giants and founded Winterfell.
Game of Thrones: The Legend of Jon Arctic – ASOIAF/GOT GOT
As he moved further into the house, he managed to find a study room, which was previously used by Arctus Black, his grandfather. There were several bedrooms in the place which belonged to his mother, his brother, and his grandparents, and two guest rooms. Clearly, he could not complain about the space that he got in there.
A few gasps came from the crowd as the boy introduced himself. While a sly smile appeared on Ronan's face, which Harry found surprising. Since they met, Ronan always had a smile on his face. But this smile that he just had, it was different, it looked like a smile that a villain does when he has cornered a hero in the corner.
[I feel like I used almost all the moves of Enel from One Piece. I searched for lightning moves and most of them were just lightning shot out in different forms.