C'tan

The C’tan (pronounced ker-TAN) or Star Gods, called Yngir in the Aeldari Lexicon, are said to be the oldest intelligent beings in existence in the Milky Way Galaxy. It is said that they were created at the very beginning of the universe, spawned from swirling gases and enormous amounts of energy, and as such are etheric creatures by nature. In their natural form they are vast beings of pure energy who spread themselves over the surface of a star, absorbing its solar energy to feed themselves. After a time, they learned to use diaphanous wings created from the universe’s lines of electromagnetic force to travel to other stars to continue their consumption when their host star died. The matter of planets and nebulae around them was so insignificant that it did not register on their voracious appetite.