Dif - a kind of Arhs of the genus Arhana - is very similar to Lumes (Lutetives) - large animal-like creatures with two pairs of wings that do not have a permanent form and live simultaneously in all possible for them, but in a certain area of space (although they were also inherited from the Archans and, accordingly, have a True form). They can configure levels, we can say that they themselves are Energy Configurators, since all their forms are the result of a large-scale creative process in the Cosmos. The way of thinking of these beings will differ in many ways from the thinking of biological beings (Lumas have resonant thinking), who are on a small spectrum of energy, and Lumas can participate in the life of many worlds, analyzing them from all possible sides (they have multidimensional vision).
There will probably be an article about them and I will try to make a ref list.
Here I still presented a not very accurate face shape of the Dif, since I started this art a long time ago and did not know some of the subtleties.