With the introduction of dead bodies in Forge I thought outside of the box: I made the dead RISE!
I positioned the bodies to appear standing up or on the move (with their property set to Phased), then with a weapon (also set to Phased) I positioned the weapon to appear like they are holding it in their hand. If you want to recreate a Covenant battlescape in Halo 5, use this tip for Covenant warriors!
I plan on making a battlescene with humans on the losing side and the Covenant rising victorious