Return of the Hunters — Sonya Bateman

""My past came with sharp teeth, and I didn't enjoy letting it bite me.""
Gideon Black has just returned from a grueling visit to the Fae realm with a stronger grip on his abilities, both as a half-Fae and the DeathSpeaker. But none of that prepared him to be kidnapped and dragged into a fight against a god.
When the Duchenes' master, an ancient and powerful Other who's taken the name of the voodoo god Papa Legba, summons the family for attempting to defy him, Denei Duchene invokes a promise Gideon made long before he knew that promises could kill the Fae. Now he must travel to New Orleans with the secretive siblings and free them from their bonds -- or die trying.
But Legba isn't the only danger lurking in the Louisiana swamps. Milus Dei, the cult dedicated to wiping out the Others, has been recruiting a new breed of hunter. The most dangerous, lethal poachers they can find, heavily financed and retrained to target and capture all types of non-humans.
And the group currently hunting the bayou is all too familiar to Gideon.