Adayusu

The Mysterious Adayusu is an offensive-type Teigu wielded by Horimaka before his death.

Synopsis
Adayusu was presumably one of the 24 Lost Teigu, since it was lost in a civil war and exhumed in the rural countryside. Its true capabilities haven't been fully uncovered, and none of its abilities are known to the readers since Horimaka was killed by Akame before he could even use it.

The fate of this Teigu is unknown, since Mein and Akame simply left the Teigu after killing Horimaka in favor of assassinating Borick.