Blood of Gods — Matt Larkin

When Adaire Winfield's friend Pihu calls him begging for help, he can't say no. Especially when she tells him someone threw a car into a restaurant and almost killed her. It sounds far too much like a relic is involved for the Seal of Solomon to ignore. But as he gets caught up in a sibling rivalry spanning thousands of years, between creatures with powers beyond anything he'd ever encountered before, he realizes this could be his most dangerous trip yet.