Lillia found the beginning page and started to read.
"Invisibility is something rather easy to learn, and most creatures interested in magic use it. It is a simple thing to use, and can't really be messed up. It just takes practice, to continue becoming invisible and staying that way. You need to focus on not being seen, and you must say Sundavar (just once) which begins the spell. If you let your mind stray too far from the thought of being invisible, you will be seen again and depending on the situation, could have horrible consequences."
This spell definitely didn't sound bad at all to Lillia. It wasn't even like you could get stuck being invisible, so it was completely safe to her.