Roana was one of the ancient Oni clans which consolidated their power around 1200 years ago. Roana was originally the militarily strongest of the five original states and a long-time enemy of Aruga. Roana allied with Dashi and with their combined power, finally destroyed Aruga 812 years ago.

Roana remained a strong and isolationist state for the following centuries, until Honshar began a campaign of uniting the Oni Empires. In a long and bloody war between 505 and 474 years ago, Roana was conquered by the Honshar who officially invaded to protect their trade interests. There are no known authentic Roanas left today.