Pretty sure she's talking about the surface when she mentions "the ground"
seems like she's talking to Satori, Kanako, and the Yatagarasu in her head about her plans after gaining her powers.
I think "pew pew pew" would probably be a good translation for "baaan" here, but i'll let someone who knows what they're doing check it out for themselves.
...Snap, Nissiku. I think you got it! I was following her up until she starts talking about taking on the colors/getting the abilities of her enemies - that would certainly explain it! lol, arm cannons.
God, Satori-sama, yatagarasu-sama, I might be a genius. lol First, I invade on the ground, um, invade on the ground like Unyuuuu and Baaaaan. lol And and, of course, the people on the ground will make me an outcast in someway like Baaaan. I'll somehow get over this, I'll somehow get over this with this in the right hand. Well, I'll think how when I go on the ground. And the main object is, I'm thinking, I merge, so fusion the ground people I beat, by this, nuclear energy. I might use her spell card, and my clothes might change a bit into her coloring, her spell card might be the weak point of someone, I'll feel so good! That must be a happy ending, a never-ending-story... By the way, I have a question, what is a "nuclear energy"? lol