[@Ariamis]
Not everything has superb hearing, Ariamis. Certainly some creatures would have better hearing than others. Pyro's character, for example. Humans and most humanoids though, have only about average hearing.

Plus, given the fact if he does go invisible in the middle of combat, it's going to make a lot of creatures probably go 'wtf?' giving him the perfect moment to pounce and eat their brain. All of his suggested abilities have the potential to be [i]quite[/i] powerful if used creatively.