I love the Arshbon! Forgive me, I phrased that wrongly. I mean I love the doctrines of the Arshbon!
Maybe it's because when they are born, they are thought to rely on each other as the only means of survival in this dangerous world they are born into.
Or it could be because their race is but one! Their form applies to the other in a way that even makes it hard for an outsider to tell one apart from the other without using essence to distinguish.
Or... It could also be because there is an absolute hierarchy in place, maintained by the harmonization of the four strongest elders of the race.
Or it is just their natural way! Their form of expression that is imprinted on them upon birth!
I don't know what is it... Which is it. All I know is they are different, very different from the humans on Earth.