Warhammer 40k - Chaos Space Marines Short Story - Atrophy by C. Z. Dunn

On a damned world, the Emperor’s Children warband of Eusabius the Proud carve their way through the soldiers of the Imperial Guard who defend the doomed human population. The killing is too easy for Kerbalkalyth, fallen scion of the III Legion, who wants a greater challenge… an ambition that is realised when the Emperor’s Finest arrive, Space Marines in armour of crimson and white, ready to give Kerbalkayth the fight of his life.