Ulthwé

Ulthwe orbits the Eye of Terror, a craftworld so close to the wound that its seers and Black Guardians exist to hold Chaos back. Eldrad Ulthran's council has steered wars across the galaxy from here, and daemons have fought in its own streets more than once. Jambonium seats it in the Ghost Stars beside Cadia, which matches the Eye-orbit lore.