These are all pretty epic. I like how Shiho's starts out fairytale-like for a second before going full boss fight theme song. Akechi goes full orchestral bombardment, which as a Dark Souls fan I like. Chihaya has a Sae vibe to it with the lyrics, which caught me by surprise. Then there's Sugimura, who has the whole factory vibe with the rhythmic backing track mixed in with the rich party style music in front. The artwork is also really well done. Now, what would these palaces actually look like? Could be interesting to speculate just from music and alert pictures alone.
(edited by Gin)