15 books in series

B.P.R.D. Hell on Earth

B.P.R.D. Hell on Earth is a 15-book series with 15 released primary works first released in 2011 with contributions by Mike Mignola, John Arcudi, James Harren, Dave Stewart, Laurence Campbell, and Chris Roberson.

B.P.R.D. Hell On Earth, Vol. 1: New Earth
B.P.R.D. Hell on Earth, Vol. 2: Gods and Monsters
B.P.R.D. Hell on Earth, Vol. 3: Russia
B.P.R.D. Hell on Earth, Vol. 4: The Devil's Engine & The Long Death
B.P.R.D. Hell on Earth, Vol. 5: The Pickens County Horror and Others
B.P.R.D. Hell on Earth, Vol. 6: The Return of the Master
B.P.R.D. Hell on Earth Volume 7
B.P.R.D. Hell on Earth, Vol. 8: Lake of Fire
B.P.R.D. Hell on Earth, Vol. 9: The Reign of the Black Flame
B.P.R.D Hell on Earth Volume 10: The Devils Wings
B.P.R.D. Hell on Earth, Vol. 11: Flesh and Stone
B.P.R.D. Hell on Earth, Vol. 12: Metamorphosis
B.P.R.D. Hell on Earth, Vol. 13: End of Days
B.P.R.D. Hell on Earth, Vol. 14: The Exorcist
B.P.R.D. Hell on Earth, Vol. 15: Cometh the Hour