Rebecca Johnson 
The Iniquity Pool [EPUB ebook] 

Five immortal Brothers, once ethereal beings known as Free Magic, were trapped by human hands and made to submit to an unholy Oath.

Four magical races combined in hatred against the fifth.

Three transgressions culminated in the death of an emperor and the awakening of a primeval creature bent on sinister deeds.

Two teens cast out on perilous journeys from opposite ends of the world.

One chance to redeem themselves before their pasts destroy their futures.