Nikolaj Arcel’s 2017 adaptation of Stephen King’s The Dark Tower, with its deep lore and mythology, may leave some audiences with questions about the ending. Truth be told, The Dark Tower, which has recently hit Netflix, is only an adaptation of King’s books in name only; some of the story beats are the same but happen far earlier than they do in the books, while others are changed entirely from the original story. The gunslinger protagonist, Roland of Gilead (Idris Elba), is also wildly different than in the books, with his core motivation being completely different.

https://screenrant.com/the-dark-tower-2017-ending-explained/