The two gods of light changed the terrain as sparkles of faint golden light became scattered in the battlefield. The two demigods wanted to use domains as well, but they are not that powerful. The two demigods have yet to fully awaken their domain that can changed the surroundings.
Just because one becomes a demigod does not mean that they can create a large domain. The best that the two demigods can do is create a small domain that is two meters in diameter with them at the center. They were able to protect themselves from the effects of the domains of the two gods of light.