There are many ways the Queen could be empowered, from utilizing artifacts of power that may be on the players planets, to unfortunate accidents involving first guardians.

Wearing both rings at once would not confer any additional *magical* power on the Black Queen, however, it would strike a serious blow to the power of the White Queen, and depending on the circumstances may make her officially ruler of Prospit.

The one way that a second ring worn by the Black Queen *would* confer additional magical powers would be if the ring were to come from another session, powered by prototypings other than those the Queen already possesses.