Warhammer 40k - The Carnac Campaign Episode Three - Spirit War by Rob Sanders

With the war on Carnac lost and necron armies marching upon the world spirit, spiritseer Nestra Orphiel summons an army of long-dead Alaitocii to hold the enemy off while the exodites of Carnac evacuate. Kael Ra, the Prince Ecliptic and long-dead hero of the craftworld, takes to a mighty Wraithlord to lead a host of the dead. As the spirit warriors clash with the numberless hordes of the necrons, the final fate of Carnac hangs in the balance.