The Covenant series by Jennifer L. Armentrout is a young adult fantasy story. The Pures are direct descendants from Hercules and other offspring of the Greek gods and can wield elements. The Half-Bloods are a mix between humans and pores and they cannot wield magic. And Daimons are corrupted and want to destroy Pure lineage.
Half-Bloods are supposed to serve and protect the Pures and are considered second class citizens. Which is also why a relationship between them is forbidden.
Genre: Young Adult
Author: Jennifer L. Armentrout