The Sins of Silas - The Light And Shadow Chronicles, #3

Poverty is rife on the streets of Belkeep. An ancient conflict with the Children of Light saps the country's resources. Silas Wilder may have been born into the royal family, but he has no interest in their eternal war. Silas is more concerned with the issues at home: homelessness, disease and poverty ravage the city while those in charge spend their time planning battles in faraway lands. A rising star on the streets, Silas is known as the 'Champion of the Slums', striving to provide a decent life, and a purpose, for those who have none.
As with all those born into the eternal war, he cannot escape his destiny for long. After a chance encounter with a mysterious figure points him towards an ancient text, Silas finds himself dragged into a role he is tragically underprepared for. Now, it's up to him to rise to the occasion and claim his true position in life - or perish.