Hammer And Anvil

"The Sisters of Battle are the Emperor's most devout worshippers, fierce warriors preaching the purity of the Imperium and scourging their enemies with bolter and flamer. When an Ecclesiarchy outpost, Sanctuary 101, comes under attack, the Sisters are quick to retaliate. But they face an unknown alien, an implacable foe that has never been encountered - the fearless, soulless necrons. With wave after wave of metallic nightmares assaulting the bastion, a vicious battle will be fought - one that can only end in the total destruction of the unrelenting xenos, or the annihilation of the proud Sororitas."--Publisher's description.