Giant mecha suit

The Giant Mecha Suit is a gigantic mecha with a spirit energy cannon super weapon attached to it's right arm. The Mecha was created by Kuvira and Baatar Jr.

History
After Kuvira and Baatar Jr. claimed victory taking over Zaofu they used Zaofu's domes to create a Giant Mecha Suit. They were keeping it a very secret project, not even Zhu Li knew about it. The Giant Mecha Suit was first used by Kuvira to take Republic City.

Base Of Operation
The Giant Mecha suit is operated with Metalbending by Kuvira. Kuvira is metalbending Mecha's arms and making it shot the Spirit Energy Laser.

Size
When Team Korra saw the Giant Mecha Suit it's foot was about the size of Kuvira's Army's Tank.