Long time, no see, End Master...
So if she was in NSR (it is basically her normal look NGL and that is actually in character since she can transcend into all realities), she would be a symphonic metal/power metal artists in an interdimensional concert hall. Welcome to the End. She would be an optional challenge boss fight that would just be an endurance round, you would not be able to damage/beat her. Just rack up the timer until the battle field is just impossible. Lightning, dark fire, dimensional warps. Dark monsters lashing out from god knows where. Broken heavens raining doom and blaring lights altering perceptions. It would be so sick.
As the “levels” go on, she might throw a whole ass space dragon at you to defeat for health bonuses and the like. you would earn skins and awards and stuff for getting to certain levels/milestones for surviving so long.
KOFI
here is some symphonic metal/ power metal/ect:
You get the idea lol this was just a quick and dirty concept sketch