Black Dagger Brotherhood by J.R. Ward
The vampires are at the brink of dying out. Their king refuses to claim his heritage, the old traditions are forgotten. The only thing between them and their hunters, the so-called Lesser, are six enormous, leather-clad warriors, the Black Dagger. But every member has his own problem: Wrath suffers from guilt, Zsadist from his past, Rhage from his curse, V from his gift and Phury from Zsadist. Only Tohrment's life is balanced after their brother's death – which sets a chain reaction into motion nobody would have expected. When the Lesser change their strategy, so have the vampires – and they're more vulnerable than they thought.