The lore behind Chaos:
Hitler designed him to be the original spread of the virus, but due to technical difficulties, Chaos, as his name suggests, was too much to handle, so he eventually locked him away with the previous 4 failed attempts, before finally coming across the idea that he needed a mortal from the living world, AKA human. So, after kidnapping one by random choice, he took Chaos's design, and because I imagined Hitler as a venomous snake demon, he infected a small virus into the human using his teeth, and after about 4 weeks of nothing happening to the human, the place finally crumbled down, releasing every hostage and abomination within the facility.
