The Shadow Fins are magic boots of Nanana's Collection. These boots allow the wearer to move instantly through shadows. Rather to being able to move throught shadows these boots allow the wearer to use them as swimming fins to swim through the shadows. The time the user is able to do this depends on how long they are able keep there breath. At the moment its unknown from what ruin these boots where acquired. but are currently in possesion of Hīyo Ikusaba.