This is proof that at least one Lord of the Land has reached Blessing Level 20. Even when they pass to the stars, they find it hard to abandon those over whom they watch. It seems some remnant of their blessing remains even after you finish the game.
Shop Level will increase when you buy, sell, or fuse equipment at shops. This is proof that you've fist-bumped the invisible hand of capitalism enough to achieve maximum Shop Level. Secret menus unleashed!
This is proof that you've witnessed the resolution of this story. Now you can try playing again with various changes to the gameplay, or you might venture into the daunting bonus dungeons.
Either on (at least) your 2nd playthrough or in Moderate (or greater) difficulty, win the final battle without retrying! If you're familiar with the game, why not start your first playthrough in Moderate right away? You'll earn more Grade than in Normal!