Fantasy book where the main characters need to find a phrase to make the villain mortal. Spoiler ahead.

[Edward]

Fantasy book where the main characters need to find a phrase to make the villain mortal, but in the end, it doesn't work. Probably a recent book

[Bonnie]

Brandon Mull's Beyonders Trilogy: A World Without Heroes; Seeds of Rebellion; Chasing the Prophecy

[Kris]

Here's the Google Books preview of the first book in the series suggested by Bonnie - A World Without Heroes by Brandon Mull:

https://books.google.com/books?id=sR0... There are different cover images.

[Kris]

Edward, I removed the spoiler ending from the header/ topic title and added a spoiler alert.

Is this book for kids, teens or adults?

Around what year did you read this book?