Brutal by James Alderdice

He has no name. His past is a mystery. His future is etched in blood…
The Sellsword knows an opportunity when he sees one. When he rides into the border city of Aldreth, he can tell that the power struggle between two feuding wizards needs a solitary spark to ignite into all-out-war. As he sets the corrupt paladins and demonic adepts against each other, he’s not surprised when the blood begins to flow…