Traits

Butterfly fins are a frequently observed fin type across Aerius, and are characterized by three distinct pieces of thick and rigid fins shaped like pointed ovals, with the middle piece being smaller and layered behind the other two. Usually the outside edge of each fin has no spine, but it can vary- the spine can wrap around the entire edge of the fin,  just the very top of the fin or there can be no spine.  This fin type is generally more opaque.