They actually *could* be responsible for it after a fashion... that could be where they originated... some primeval alien intelligence far out is the heavens launched the asteroids towards the planet... it's plan would have succeeded on several levels.... many of the gods sacrificed themselves to save the planet, reducing the amount of credible resistance it would face in taking control... & it's servitors were delivered in mass (any creatures we place with the psudeonatural templates - dont forget there is a non-epic version of the template in Tome & Blood we could use for lower level campaigns...).