Abandoned Factories

The Abandoned Factories, also known as the Ruins of Despair, are dome-shaped structures containing factories located outside the Valley of Amphibia which have the capability to produce automations such as robots known as Frobots when received the signal from Newtopia Castle now powered by the Calamity Box.

Appearance
Though appearing quite minuscule from its above exterior, much of the factory is located underground leading from the top entrance, a set of bronze metal gates. The top dome is in the shape of a frog with two windows set above the doors resembling eyes. There is a steep passage which leads to the main factory assembly line, which consists of a main electronic panel used for controlling the production via various buttons, switches and a CD drive. When used incorrectly, the panel goes into "assault mode" and activates a buzz saw. Behind glass panels surrounding the panel is the assembly line itself, which contains many robotic arms and a metal conveyor belt. A lever located above the main panel is used to activate the factory.

History
During the glory days of Newtopia, the factories were used to create frog robots to serve King Andrias, but after an unknown pink frog who was a friend of Andrias stole the Calamity Box, the robots and the factories were abandoned.

Very little is known about the Abandoned Factories, according to Hop Pop, but that they existed long before the creation of the Valley and have remained untouched since then. When a factory was activated by Sprig in the episode "Fort in the Road", automatic production of a robot frog began, with one being finished just before the factory collapsed when the main panel went out of control. The robot frog that would be known as Frobo kept on following the Plantars and Anne to Newtopia.

During "True Colors", when the Calamity Box was placed down onto an activation platform, all the factories reactivated, creating new upgraded models of Frobo AKA Frog-Bots, and sent them all towards the flying Newtopia Castle.

Trivia
In Reddit, Matt stated that Wartwood Swamp is over 1000 years old. In theory, that means the abandoned factories were created way before that said town was created.