Makes Lydia invisible, So she looks more like the weapon and or armor she is carrying.
Farengar has rewarded the dragonborn by secretly creating lydia, A construct that can take any weapon form given to it.
you might have to get into a battle first for some weapons to appear "like my floating books mod the staff item" ;)

Recommended mods
thelawfulls floating books by me! :)
It is obviously not needed but cant say a floating book is not awsome!