Conch Shell Mace

This mace is Kotetsu's tool that he usually stores in a scroll and summons in battle when necessary. It resembles a conch shell with numerous sharp protrusions all over its surface and a marking in the centre that resembles an eye. Its hilt is wrapped in bandages, and a chain connects the mace to the base of the hilt. Kotetsu uses it in combination with Izumo's Water Release: Starch Syrup Capturing Field, making it easier to deal a devastating blow after the target is immobilised.

In the anime, it was shown that the protrusions on the mace can spread or integrate to form wing-like appendages that enables it to soar into the sky and evade attacks from the opponent. Even while separated, Kotetsu seems to be able to retain control with the mace's trajectory through the use of hand gestures.