Barnacle Chest of Legend

We don't need another Shrouded Ghost or Box of Whatever the secret thing is........

I like the idea a lot, would be amazing if all treasure had barnacled variations and random spawns on islands should not be limited to Castaway - Captain chests, every piece of loot should be available to be found randomly. Very rarely depending on items obviously, but it would encourage exploring the islands more, looking for surprises.