For a house boasting some of the finest genesmiths in the local group, sometimes the patriarchs of House Goliath don't pay close enough attention to their Geneforges. In the lull between gang conflicts they mothballed a Geneforge Facility in the lower hive when it became infested with local pest animals, chewing wires, spoiling chemicals, tripping lab workers. Any large scale purge of the pests would damage the Geneforge equipment or taint the expensive synthetic elements used in the tanks. So in the grand old tradition of There Was An Old Woman Who Swallowed A Fly short-sightedness they applied pressure to an exotics trader and acquired a variety of reptiles which they set loose in the infested Geneforge. The plan was, give them a few weeks to clear out the infestation, then lure the reptiles back into their cages by using their behavioural chips. That is not what happened. There was a plague in the lower hive. And a particularly bad hivequake. Intermittent gang wars that crawled up from the undercity. A surprise Genestealer infestation. House Goliath were busy. Ten years later, house Goliath adjutants opened the Geneforge to find that a variety of lizards had made their way into the Vats and when slurried with Prime Goliath Genestock had undergone a bizarre form of anthropomorphisation. Rather than the long rumoured 'scaly mutants' who dwelt in the undercity, they found a small civilisation of enormous Scalies speaking passable High Gothic had evolved inside the facility, feeding themselves on the rich nutrient sludge still piped into the Goliath's Geneforge network. All they have had to read is a loose copy of "The Imperial Creed" and "A Pilgrims Guide To Nord Merican Cantons" explaining their peculiar naming conventions. They were polite to the House Goliath workers who discovered them, promptly handing over control of their behavioural chips to their long destined 'Masters' and in spite of being ten foot tall lizard people are model imperial citizens. In normal hive society, mutants of this calibre would be frowned upon, but in the underhive, full of cults, gangs, archaeotech nightmares and hostile agents from other houses, why not let the Genforged Synthscales loose on the expendable local populace.