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In Warhammer 40k, the Tau Empire is lead by Ethereals.

The 5th Tau codex states ‘it is speculated that they (ethereals) exert some kind of pheromone based or latent psychic control over the other castes... the adeptus mechanicus and adeptus arbites are very interested in this aspect of tau culture.’

Has this control been elaborated on in any way in official canon? Any canon source such as codex, rules, white dwarf etc is acceptable.

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    There are tons of speculations but to my best knowledge, there is no definite answer. – Yasskier Mar 20 at 2:07
  • That's classic 40k lore: they keep it blurry and mysterious so that players are free to imagine what they want. Is there something fishy about the Greater Good? Hopefully, if GW comes up with a good story, we'll learn more. We have been knowing nothing about the Legion of the Damned except "they appear in time of despair" for a long time for decades. – Taladris Mar 23 at 11:12
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I have no other source than this video from the 40k Theories channel on youtube. According to this video, it is unclear how the ethereals control the Tau. The current official canon seems to be pheromones and the diamond shaped organs. However, there are hints that it might be a psionic ability.

Reasons for this is, that although Taus have nearly no representation in the Warp, the Ethereals have one. According to the video, on the world of Arthas Moloch, the daemons the Tau met there first killed the Ethereals accompanying Commander Farsights expedition and only then battling the other Taus. This hints at Ethereals being psionic, as Daemons are drawn to psionics.

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    That is possible, however, when Tau experimented with warp travel without Gellar field, Etherals have survived while other, more sensitive races on board (i.e. humans) were wiped by demons. So this psychic power must be very, very weak or very specialised. – Yasskier Sep 24 at 23:50
  • Or they were able to errect barriers of a kind. Thing is, I don't really know Tau lore but what I know from youtube videos (arch, 40k theories mostly). When I saw the question, I remembered this video and answered, quoting the video. – Shade Sep 25 at 5:58

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