Caerys is a Farseer from Craftworld Ulthwé, and the leader of the Eldar forces in the Kaurava system. She is allegedly the successor of Farseer Taldeer. The Eldar are based in a site sacred to them, on Kaurava III, where they destroyed a manifestation of the C'tan god, the Deceiver, while defeating local Necron forces.
- If the Eldar faction succeeds in defeating the other factions, the Farseer's forces mysteriously vanish, leaving the few surviving Imperial Guard units in the system to re-build. When Imperial reinforcements arrive, they begin retaking all planets in the Kaurava system except the planet Kaurava III - the planet where the Necrons lie dormant once again. As a result, the Eldar foil any human colonization attempts; so much so that the Imperial Guard eventually decide to leave the planet alone.
- If the Eldar are defeated, Caerys, rather than facing death or capture, retreats back to her Craftworld through a Webway Gate, declaring resignedly that if the Necrons ever awaken again on Kaurava III another race must stop them "For we, shall be gone."