Shingu

The Shingu are artifacts created by the Emperor of an earlier era. They are highly similar to Teigu in that they have special abilities based on the Danger Beast used to create them.

History
The Leader of the Empire 400 years ago sought to create newer, stronger weapons that could surpass the Teigu. The Emperor then set out to create his new artifacts and was ultimately successful. However, the new items he was able to develop did not match the strength of the Teigu. Feeling shame at his failure, he ordered the Shingu to be sealed away.

Many years later, the Shingu would be obtained from the secret storage of the Empire, and given to an elite assassination division of the empire, which included Akame.

Trivia

 * The character for "tei" in Teigu stands for Emperor or Empire, while the character "shin" in Shingu stands for Vassal or Subject, referring to the Shingu's inferior power to the Teigu.