Ulthwé is one of the largest remaining Asuryani craftworlds that survived the Fall of the Aeldari.
It is whispered by those of other Craftworlds that the Asuryani of Ulthwé have been damned and tainted by their world-ship’s proximity to the eastern rim of the Eye of Terror in the Segmentum Obscurus, exaggerating their psychic potential.
This is also why these Asuryani are sometimes called “the Damned.” But the people of Ulthwé know instead that they are a bulwark between the survival of their species and utter destruction.
Ulthwé has long sought to covertly intervene in the affairs of the other intelligent species of the galaxy, particularly Humanity, in an attempt to alter events to favour the continued survival of the Aeldari race and defeat the threat posed by Chaos.