..."You cannot choose the blue sky."And that gap in the cave ceiling is the path for it...Regulating the power of sunlight is much harder.It's power that's strongly aspected to attractive forces.Hmph.It's almost got a mind of its own.In short, the magic energy it uses comes from the moon!It's just like you said.It's a bit weaker, but if you've got a choice, you'd definitely go with that.Right.As energy goes, it's stronger, but...This makes the whole thing self-contained.In comparison, the moon's more stable and less willful.How did I not notice earlier?