using spells and their usefulness on the map and in battle.

There's a lot of stuff in the game that feels like "just for the sake of having it" (and even "it would have been better if it wasn't there"), but it exists. Out of what you mentioned, I sometimes use Camouflage. The rest just doesn't work, especially Unluck, it's the most useless skill, it never triggers no matter how many times you cast it.