The rock drake chronicles:

Chapter 5:

E.D found a hole and out of nowhere a giant rat came out of it and ran away as soon as he saw the rock drake he wondered what he ran for

But the he got a message it said “YOU HAVE REACHED JUVINILE” he thought how long it would be before he was an adult but then he saw a ravaged charging at him he braced for impact but then it stopped and just walked around confused but he the rock drake noticed he turned

Invisible! So he ran away into the bushes but then he turned back to normal and he thought he only turned invisible when he was in danger.

So he would have to learn to control it.