When the Stars Fall: The Ballad of Tul'ran the Sword Book V

Then the fifth angel sounded, and I saw a star from Heaven which had fallen to the earth...
Revelation 9:1

They were bold and courageous, fighting to free the oppressed from the evil of the world. Their love condemned them, but tore others out of the arms of darkness and led them into the Light. Suffering waits around every corner as the Fifth Trumpet sounds, unleashing on a decimated Earth the angel, Abaddon the Destroyer.

This is the fifth novel in the Tul'ran series by author Dale William Fedorchuk