Ik a guy from the mother RP... thewizardguy, and he basically owned the God-Emperor himself. Nerfed him down substationally, but he was still tremendously OP. I say that you can bring small legions of at most 300 - 400 men, but please don't bring the God-Emperor. I also have very little knowledge of the 40k universe but from what IK, its insanely OP.