Persistent pockets of resistance challenge the swiftly expanding T’au Empire, with one uprising threatening to consume the newly acquired world of Cao Quo in Elemental Council by Noah Van Nguyen. A fierce insurgency led by Brother-Sergeant Artamax of the Raptors Space Marine Chapter must be swiftly quelled, prompting the young Ethereal Yor’i to gather an elite team representing all four castes to track down the elusive Space Marines.