Object classes refer to the ease of containment.
Safe- if you could be the anomaly in a box and nothing happens, it’s safe
Euclid- if you put the anomaly in a box and it might break out, it’s Euclid
Keter- if you put the anomaly in a box and it will break out, it’s keter
Thaumiel- if the anomaly is a box , it’s thaumiel
Apollyon- if the anomaly could never be contained by any box, it’s Apollyon