Khionia is the wealthy homeworld of the Khionians, which the cadet Darem Reymi is destined to co-rule.
Khionia is the home planet of the Khionians and of the academy cadet Darem Reymi, whose privileged upbringing there shapes his expectations at Starfleet Academy.
In Ko'Zeine, Darem is drawn through a portal into a Khionian pre-wedding ritual, followed by Jay-Den Kraag, and it is revealed that he is due to co-rule Khionia with his fiancée Kaira several years after graduating. The wedding falls apart when Kaira decides he has changed too much.