I'm imagining that floors are like planets ordered in line, and if you want to travel accross those planets you must go from planet to planet, in designated order, so:
- untill Zahard came there was really hard to pass even 1 floor, which means only a few might have made it, the others all got killed
- climbing the floors is like people with limited fuel or power/strength, but without navigation traveling from Earth to Mars - if not for a guardian who gives you direction your body(lets say your body can travel in space with a little higher speed than on Earth) would travel blindly from Earth to Mars and most of the time got lost somewhere in large space, meanwhile when you travel you can NOT carry any food or water with you, so your body would soon be out of power/energy or with my interpritation "fuel", and like that you would be left to die somewhere in space
- Zahard and members of 10 great Familys are responsible that now there are artificial transfer points, that lead people from one floor to another, but you must prove to them that you are worthy to be send to the next floor
- irregulars are the only people, who might break/twist a lot of rules here, while climbing (I'm imagining them as "metheors" who are falling from the sky - unpredictable and not able to determine their number or content, it might even happen that in some there are living beasts/organizems...:iik) !!!