Different Ocean monument

This could be a structure made out of copper (i k) and glass underwater, and it would all be made out of the most weathered copper and fits into the lore. It could be looked at as op, but weathered copper would be considered cheap and worthless. *Spoiler if you want to try and figure out the mc lore* The old builders would have mined all the copper and have made it rarer. The copper structures would have been kept up and constantly waxed, but eventually, once the builders disappeared, the wax came off, and the copper 'greened'. These copper structures would be dome-shaped, and the domes could be different sizes for how important the domes are. The top of the domes would be made out of glass to watch for certain mobs. This could also add a way to 'un-weather' copper and it could use the new caves and cliffs brush.