Warhammer Fantasy RPG: Enemy Within - Vol. 5 - Empire in Ruins Companion Roleplaying Book. Role Playing Game Book. The Empire in Ruins Companion is the fifth and final volume in the five-part series of companion volumes to the Enemy Within campaign. The essential companion to campaigning in a shattered Empire is packed with supplementary material to not only expand Empire in Ruins but also provide an indispensable guide to any WFRP games set within the fractured nation.