|This article is about the Barnacle. You may be looking for Blue Barnacles.|
Barnacles are similar in appearance to the Blue Barnacles and clearly have some sort of relation to them.
Barnacles can drop the following:
Data Bank Entry
Unlike most barnacles, these do not grow in clusters but in single instances found uniquely on reefback shells. As the leviathans age they collect scars from overconfident predators, which fill with dirt and metal deposits, around which these barnacles form.
Assessment: Source of copper and other metals