The Thexians, also called the Thexian Elite, are a bimorphic xenos species hailing from the oxidised worlds known as the Bloodmoons of Thex Prime.
These worlds are located to the galactic northeast of the Ghoul Stars and represent 15% of the total worlds that comprise the Thexian Trade Empire.
The Thexians are said to be few in number but strong in influence -- these vile aliens are known to be masters of manipulation and have worked themselves into integral positions in the Borlac, Loxatl and Nicassar civilisations.
Though Thexians are famously persuasive, when guile is not enough their unleashed battle form is quite horrifying to behold.
- Warhammer 40,000: Rulebook (5th Edition), pg. 117