Tensou Gattai Gosei Ground

Tensou Combination Gosei Ground (天装合体ゴセイグランド) is the combination of the Groundion and the Knight Brothers. Gosei Ground's attacks include the Sealeon Kick (シーレオンキック) and the Eraser Missiles (イレイザーミサイル). He can also launch the Knight Brother Headers as guided projectile weapons similar to Gosei Great's Header Attack. Gosei Ground's final attack is the GrounDrastic (グランドラスティック), firing a barrage of Eraser Missiles that hit the opponent before Gosei Ground himself rips through for the final blow.

Groundion
Groundion Headder (グランディオンヘッダー): The Groundion Headder is Gosei Knight's true form. After combining with an off-road dump truck body, he becomes Groundion (グランディオン). As Groundion, he uses his mass for slamming attacks and can fire Eraser Missiles from his wheels. His finishing attack is the Groundion Laser (グランディオンレイザー) where he shoots a spiraling energy beam from his mouth while unleashing a torrent of missiles. He forms the main body of Gosei Ground and chest and feet of Ground Gosei Great, with Gosei Knight himself forming the head in both formations.

Knight Brothers
Knight Brothers (ナイトブラザー): The Knight Brothers are a duo of lion-based Gosei Machines composed of Sealeon (シーレオン), whose Headder combines with a cruise ship body, and Skyon (スカイオン), whose Headder combines with a blimp body. They respectively form Gosei Ground's right and left legs as well as Ground Gosei Great's respective arms.

Ground Gosei Great
Ground Gosei Great (グランドゴセイグレート) is the combination of Gosei Great and Gosei Ground.

The tip of its weapon, the Gosei Lancer (ゴセイランサー), can be mounted with either the Kuwaga Headder, Manta Headder, or Taka Headder to perform various techniques that amplify Skick, Landick, or Seaick abilities.

With the Kuwaga Headder, the Gosei Lancer can be used as an extending Sasumata. With the Manta Headder, it produces a tidal wave when swung. With the Taka Headder, it can fire an energy pulse.

Ground Gosei Great's final attack is the Ground Great Strike (グランドグレートストライク) using the Kuwaga Headder to cause an eruption that consumes the target.

Ground Hyper Gosei Great
After combining with the Skick Brothers, Seaick Brothers, Landick Brothers, Knight Brothers, the Groundion Headder and Datas Hyper by using the Mojikara power from the Shinkengers, Gosei Great becomes Ground Hyper Gosei Great (グランドハイパーゴセイグレート) in Tensou Sentai Goseiger vs. Shinkenger: Epic on Ginmaku. In this combination, the hammershark header is on the left shoulder and the hyper change header is on the right shoulder. The knight brothers are in the places where the hammershark and hyper change header usually are, and the Groundion header becomes the main head. Ground Hyper Gosei Great's final attack is the Mojikara Headder Strike (モヂカラヘッダーストライク). This formation only appeared once.