Ona are a race of fungal creatures brought together by a single drive to unite into one entity, from which they claim to have originated. It is unsure how they intend to achieve this goal, but the eerie organization and intent they display puts other races on edge. They are said to have a sort of hive mind, but appear to all be individual beings. Ona can communicate telepathically with each other, and are mistrustful of other races but don't hesitate to use them to further their own goals. Known to only care for themselves (and so their society) they seem incapable of empathy or feeling. These beings find their homes in damp caverns and tunnels, and are particularly fond of darkness.

Ona hail from Celecairn where they mine rare stones called "eyes of Cerys", which they sell to Acanthio(where they are considered almost godly).