I think those are great ideas, how about things like hail, fog, blizzards, sandstorms, lightning storms, oceanic storms (waves and such), volcanic eruptions, locust swarms, flooding, meteor showers, wildfires, extreme winds, unfiltered ultraviolet rays, man eating plant infestations, corrupt titans (bringing corruption to new areas), pollen explosions, predatory bird migrations, bee hives, tornadoes, eclipses, magma spouts, earthquakes, plasma clouds, torrential rains, frost overs (everything freezes), toxic gas releases, and droughts.