Engine: overarching gravity: make objects sink/rise in water and fall in the air
ATM items simply appear on the ground when they are dropped in water as well as in the air.
It would be nice if there was overarching gravity so that all matter (that doesn't levitate/fly) falls to the ground and sinks to the bottom or rises to the surface.
A silver mace should fall from the sky and sink in water. A chitin* would probably always float to the surface. Maybe there can be an automatic calculation if the displaced water is heavier than the item or not related to it's measurements and weight.