D-Rex is the boss of the third section of Sigma Palace in Mega Man X. It was supposed to be a large Mechaniloid based on the T-Rex (hence the name), but by the time the fortress was discovered by Zero, only the head was completed, forcing Sigma to convert it into a tank. Its top can detach from the bottom, hovering in the air, and both try to crush and seriously damage X. When either section collides with a wall, it can daze X and knock him off. Both sections can also charge up massive electron spheres that inflict devastating damage. Its main weakness is the Boomerang Cutter. __TOC__