Board Thread:Warhammer 40k General Discussion/@comment-5647122-20161002001146/@comment-24226187-20161007002200

The concept of evolution states that species in question is subject to natural, either drastic or simplistic alteration of their genome sequence as best fit their environment. To put it in simpler term the reason there are so many subhumans and species in the galaxy is because their long term existence on a determined location had force that specie to change in order to not only survive but to thrive like the Ogryns, Fenrisian Wolves and Even the Tau with their numerous sub species depending on their origin caste. This also applies to the Psyker side of the story. Mankind, as its stated on canon, has only just begun the evolutionary transition into a psychic species. It also states that a certain genomics mutation is required for any species to immerse themselves in the psychic realm known as the warp and draw forth its terrifying power. The only specie to wholly reach the warp without succumbing to its corrupting power is the Eldar race.

It is known that the Eldar race was designed by a ancient and powerful race of cold reptilians being known as the Old Ones. This race was said to be the firstborn and wielded the psychic might to destroy a planet with but a whimsical thought. This beings entered a war against another powerful yet older race of star devours, The C'tan. Top combat this threat the Old one created races to fight this being and their soulless legions the Necrons. One of such races was the Eldar which they imbued with a psychic might second only to them - This was due to the C'tan weakness of psychic attacks. Thus with the help of the Old Ones the Eldar became the arrogant yet graceful specie that treads the 41th Millenium between survival and damnation.

Now its true that every specie created by the Old Ones have a distinct relation with the psychic realm, even the Orks. Which give birth to the common theory about the that most 40k fans held - The Tau are designed not by the Old Ones but by the Necrons as their less than average soul reflection in the warp barely registers as nothing giving them an unusual advantage against the foul creatures of the Warp as possession and direct psychic attacks against the Tau are negligible. Of course any indirect and physical psychic attack will still hold true. This ability had been interpreted by many fans as a anti-warp passive defense technique which only the Necrons would be interested in festering since they actively seek to destroy any link the physical and psychic realm shares as they too suffer from their old masters weaknesses.

Then again their likelihood of producing a psychic sub race withing the tau physiology are slim to none although its worth to mention that their leader caste may have a developed latent psychic powers as their unusual compliance in the presence of an etherial goes beyond logical into the zealot realm.

But then again these are just theories.