Trinity Armor

The Trinity Armor (トリニティアーマー) is a giant, robotic Unversed fought in Radiant Garden made out of three individual parts like the Guard Armor Heartless. The Trinity Armor is the only known boss to fight against Terra, Ventus, and Aqua at the same time.

Video
http://www.youtube.com/watch?v=G5Csfnm70-U