Cirque Du Freak: The Manga, Vol. 5: Trials of Death — Darren Shan

In agreeing to undergo the Trials of Initiation in order to restore Mr.
Crepsley's honor, Darren may have bitten off more than a half-vampire
can chew. Each trial is taxing than the last, and despite his resolve,
Darren simply may not be up to the task! In the depths of Vampire
Mountain, though, a threat even deadlier than the Trials is stirring...