T'hekk'ethek
A particularly foul Xenos semi aquatic living in the ammonia oceans of the cold moons of gas giants and possessed of an advanced grasp of technology.
They have tentacled heads like a cross between Cthuthlu a mind flayer and a squid bulbous bodies with short limbs and walk on land with a waddling gait but are graceful and swift in water or in the void.
They have had several encounters with the Imperium none of which has ended well & there is evidence that they have traffic with the ruinous powers. There home worlds are not known but are already marked for exterminatus
Ginger