Kethradii

The Kethradii are bitter enemies of the Vyallin who are ruled by the Iscelios family.

Appearance
Kethradii are rock-like creatures who are shorter than the galactic standard.

Vyallin
The Vyallin and the Kethradii are mortal enemies.

There has only been one known example of a Kethradii and a Vyallin coming together-this was the case with Ganymede Iscelios, daughter of the Vyallin queen Minerva Iscelios and an unknown consort.