The Dark Tower is a dark fantasy series written by Stephen King consisting of 7 books (and a spinoff). The series connects all of his works together. A comic series exists based on the work, as does a recent film that stands as a sequel to the books. A television series tying into the new film is also currently in production.
Power of the Verse
The Dark Tower is an incredibly powerful verse. Each floor of the tower is infinitely greater than the previous. It has every Stephen King character ever written, including several cosmics. To top it all off, it has several higher-dimensional beings, as well as two beyond dimensional entities.
He Who Walks Between The Rows
Charlene "Charlie" McGee