Shikoutazer

Imperial Guardian: Shikoutazer was a massive armor-type Teigu used by the very head of The Empire as a last line of defense if the Capital was ever to be destabilized.

History
The Teigu itself was built and passed throughout generations to the Empire's heads to be used as a last line of defense if the Capital was ever to be placed under imminent threat. For centuries, it was stored deep underground, right beneath the Emperor's palace. During the Revolutionary Army's uprising, Honest advised the Emperor to use this particular weapon against the rebels.

Abilities
The suit itself is extremely massive and tall enough to overlook the empire itself. It is heavily armored, protecting its user from nearly any attack directed towards them as well as being able to deliver devastating blows. Due to its size, mobility is very limited, but it is however, armored with various equipment that enables its user to gather energy and expel large amount of shockwaves throughout various parts of its body. This method was preferably designed for long-ranged attacks.

To prevent it from being used by the Empire's enemies, Shikoutazer was designed so that it could only be wielded by those of royal bloodline.

However, the armor places huge amount of strain on the user, eventually weakening its main defense, primarily in its abdomen region.

Trivia
Shikoutazer
 * In the manga, Syura mentioned about a Teigu which can only be usable by Emperors. However, this Teigu is not shown currently.
 * In the English dub, Shikoutazer was renamed to Primus Imperator, which means "First Emperor" in Latin.