Rubi-Ka is a fictional planet in the online multiplayer game Anarchy Online. It serves as the primary setting for the game, featuring diverse environments such as deserts, forests, and urban areas. The planet is rich in resources, particularly Notum, a valuable substance that powers technology and enhances abilities. The inhabitants of Rubi-Ka include various factions, such as the Omni-Tek corporation and the Clanners, who are often in conflict over control of the planet's resources. Players can explore Rubi-Ka, engage in quests, and participate in battles, shaping the ongoing narrative of the game.