In the rich text editor:
[item=3258]
In comments and forums:
[](https://worldofgaia.org/world/items?name=Halo Fin)
A long ribbon-like fin that connects on both sides of the body.
Drops from the bosses: Royal Mimic, Hati, Skoll, Kitsune, Great Phoenix, Vampire, Yuki-Onna, Grim Reaper, Quetzalcoatl, Arachne, Archangel, Golem, Celestial Dragon, Genie