Not sure if this has ever been suggested (probably has), or if it would even fit into Valheim lore at all, but I think it would be interesting to have some more extreme weather and environmental effects such as tornados and hurricanes, earthquakes, tsunamis, flash floods, wildfires, and other stuff like that. I don't think it would be fun if these things were super common as it might be annoying if your buildings are constantly getting destroyed, but these things could be really cool as a rare occurrence, or maybe easily ignorable once you get past the early game materials or something.