Most changelings have a proficiency in magic that involves gravity, so they instinctually know spells like levitate. They are able to float a couple of inches but it is near what they used to be able to accomplish.

The common etiquette for Cosmos Changelings are to speak clearly but also quietly, they find it extremely rude to yell or raise your voice.

Cosmos Changelings learned many different types of languages up in the heavens including Primordial, Undercommon, and Deep Speech. 

Cosmos Changelings are slow to grow, much like stars, they glow more when they grow older and at the time of a Cosmos Changeling's natural death, which is usually around a milennia, the changeling explodes in a blast that would rival bombs at the time that the Flarelands takes place. For this reason, a lot of Cosmos Changelings are treated better if they are young and the elderly are shunned by the general populace of the Flarelands.

Cosmos Changelings do not eat food, rather they eat minerals and magic. If there are no minerals around, their body will make sure that they do not starve and it will start sucking the magic out of the people around them if those people possess magic, subconciously, the changeling will only realize that they feel better, not that they just sucked the magical energy from another person. This has also led to the changelings unpopular opinion with society, and they are not allowed in certain towns that do not have a mine avaliable nearby, as magic is scarce enough as it is.