There are 2 books in the The Fire Sacraments series. The newest book is Sidewinders which came out in 2021.

1
Master Assassins

Book cover of Master Assassins
2018 BookNest Fantasy Awards Finalist for Best Novel

"This book has everything I love: Clean, crisp worldbuilding. Characters that live and breathe. A story that teases and surprises me. I like Master Assassins so much I wish I'd written it, but deep down, I know I couldn't have written it…
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2
Sidewinders

Book cover of Sidewinders

Two brothers flee an army of fanatics across a vast and magical desert in this white-knuckle sequel to Master Assassins from Robert V.S. Redick, author of The Red Wolf Conspiracy.

The worst of rivals, the closest of friends, the two most wanted men in a war-torn world: Kandri and Mektu…