For the galactic community the Diathim are mostly a mystery, more commonly known simply as angels. In tales they are often described as the most beautiful species. Pilots that have encountered them even claimed them to be a beautiful member of their own species, even if they weren't humanoid themselves. In appearance the Diathim have an elegant humanoid form, but are very tall and slender to the point of appearing fragile when compared to humans. Their average height is between two and three metres tall. Their skin radiates a yellowish glow, making it difficult for species with low vision to make out detailed features on their luminous skin. They also have no apparent body hair besides that which grows on their heads.
One of their most prominent features is the six blade-like wings adorning their backs which makes the Diathim capable of flight and with their ability to survive in a vacuum they can also travel in space albeit for short periods of time.
There is no known Diathim government or technology, however it is speculated this has little to do with their lack of intelligence but more because they have no need for it. Their peaceful and simple disposition seems to have allowed them to endure without any reliance on current technology. This lack of advancement is more mysterious coupled with the fact that they do not need to eat. Very little is known about their society and the Diathim rarely speak and by nature do not learn languages, though their voices are soothing and harmonious to most other species. It is assumed they communicate with each another by telepathy, further adding to their mystical appearance.