You Stirred The Hornet Nest!
The Black Phantom was, by far, the strongest being he met aside from that nine-tailed fox. If not for his deeply rooted hatred, he'd have preferred to build up clones of that fox.
He started to work on the models, making seven identical-looking monstrous weapons from the surface. He made them huge, with lots of shields and armours surrounding their bodies. They looked like humans, but without eyes, and with huge bodies and wings.
"I can't let them fly by my current level of power, but I can let them do something else with these wings…" he knew these wings could be used as weapons, and made sure to add flying feathers on the wings, ones that could be controlled by these monstrous weapons.
He didn't forget to add a huge storage space where he placed tons of elixir bottles there for their use. And then he started to take care of the weapons inside every one of these.