Angry space dad, what happens when Astral is angry? 

Many things, it turns to night and any clouds that were in the sky are gone leaving people to see the red hue in the sky and all the constellations glowing red. Astral's normal bright color palette turns to pink, black and orange, gravity around the area no longer exists, the air turns cold and portals to space open up near him to help him with whatever he needs. 

He can easily kill off anything even if it is suppose to be unkillable.