The Black Tattoo

Jack's best friend, Charlie, is in serious trouble, possessed by an ancient demon called the Scourge who plans to use Charlie to bring about its evil ends-which, unfortunately, involve the destruction of the entire universe.
Now Jack and the butt-kicking, sword-wielding Esme must contend with floating sharks, intelligent jelly, oversized centipedes, gladiator pits, and vomiting bats, all for the sake of saving Charlie from the Scourge.
And, hopefully, saving the universe from total and utter annihilation.