PoisonedPawn777

I know what you are talking about, you can break them down in a crafting grid with a chisel into gold or silver bits. To my knowledge, having played through the full story as of now and spent far too long looting ruins, that is the only location they are present. I don't know if the treasure/monsters respawn after a certain amount of time though (I believe the RA does).

Before loading into your world on the far right there is a tab that allows you to edit or delete that world. If you go into the customize tab you can adjust the world settings before saving and starting the world back up. It'll be the first option under the Temporal Stability tab. It can also be turned on/off in game with the command /worldconfig temporalStability [false|true] and then restart your world to have it take effect, noticed it was a bit finicky though.