It's possible that:
* You're thinking of a different Avatar story or spin-off: There are many different Avatar stories beyond the main series, including comics, novels, and video games. The "Omaso" might be a location or element in one of these.
* You might have misremembered a detail: It's easy to get details mixed up, especially when it comes to intricate stories. Double-check the source you're referencing to make sure the information is accurate.
To help me understand and answer your question better, could you please provide more context? For example:
* Which Avatar story are you referring to? (e.g., Avatar: The Last Airbender, Avatar: The Legend of Korra, or a specific comic or novel)
* What is the "Omaso"? Is it a place, a character, or something else?
* Why do you need to escape the "Omaso"? What is the situation?
Once I have more information, I'll be able to provide you with a more accurate and helpful answer!