Rare Suit

Rhea Suit is a Shingu shown only in the prequel series, Akame Ga Kill!: Zero. It takes the form of an armor. It's wielded by Gai.

History
Rhea Suit, like all other Shingu, was created four hundred years before the start of the series by the emperor of that time in an attempt to create weapons that could surpass the Teigu.

It was kept hidden in the Empire's secret storage until It was given to Gai by Gozuki.

Abilities
Rhea Suit's ability is using earth to its advantage. Its biggest advantage is digging underground, which can be used to surprise attack unaware foes however, using it puts great strain on the user's body.

Trivia

 * Rhea is the name of the daughter of Gaia, the Greek goddess of Earth.