dnd fantasy city background, flat, fortress, dark, pier, night, panoramic. Color palette: #F2F2F2 #211426 #1F3B73 #2D3540 #525859 #AAAAAA #3B4554 #060606 #2D3540 reference image: <https://s.mj.run/ApNlz46AaPU> --ar 1:1 --niji 6