[@Guardian Angel Haruki]
This is more of flavor than mechanic. But instead of the grimoire/tome being called "Book of Shadows", how about we call it "Book of Clouds" as it may appear by materializing from clouds, floating on them, and faint puffs of clouds emit from it. I feel the Shadows theme of secret knowledge hidden with in can still transfer over okay for the Clouds as can still blur or general obscure information that may be hidden within/behind it. Your thoughts?