The world of One Piece is filled with quite a lot of incredible mysteries and, over the years, one of the very biggest ones pertains to a legendary pirate who goes by the name of Rocks. Rocks was first introduced to fans during the Wano arc, between Act 2 and Act 3. This introduction came through the character of Sengoku and, immediately, it was made quite clear that this particular pirate was not an average one by any means.