The immense Dark Guardian is the superweapon of the Viroid forces and their more powerful knockoff of the Golden Guardian used by the Golden City.
The Dark Guardian was built by the Viroids after they retreated to the bottom of the mountain as a countermeasure to the Golden Guardian. It first appeared after the Gorge Crawler army was delayed from attacking the Golden City by the Exo-Force, decimating most of their forces. It made a tactical retreat into the gorge after the core five returned from the Watch Tower.
The Dark Guardian is a massive black humanoid Battle Machine with grey highlights scattered about. It has two massive shoulder cannons, Two leg-mounted Gatling Laser Cannons, A flamethrower in it's left hand and a giant black shield in it's right. It can also fly at speeds of Mach 3.