They have always existed, but the more humanity forgot the multiplication table, the more they provoked hatred, and so by the end of the year 10,000 AE (note — after Empress), they were banished. But due to the underfunding of the project «Zero tolerance to botanists», they were banished closer — to Mars. There botanists had nothing to do how to create mega-factories. So for 1.5 millennia, Mars turned into one giant mega-factory, which was called Forge because of unclear reason of the hanging anvils everywhere. Botanists were rehabilitated by the Empress only when they managed to create robots-rapists, which were used in the defeat of the rebels.