According to his previous deduction, there are only two possibilities after the Feng Yue Demon Emperor learns about the existence of the Barbarian Emperor.
One is to control the Great Demon King and the ancestors returning to the Tianyuan Continent, eliminate those with ulterior motives among them, and then openly fight with the Barbarian Emperor.
The second is to endure and not act, continue staying as the Demon Emperor in the Ten Thousand Mountains, slowly amass power, and wait for a change in the Taizhou Mountain Demon Court before striking with overwhelming force.
Regarding the passage at the East Sea Coast that the Feng Yue Demon Emperor desires, Chen Yi thinks she probably doesn't intend to launch a massive attack from there.
After all, attacking Taizhou Mountain from the passage within the Ten Thousand Mountains is still possible, but if she detours via the Wei Dynasty or the Taizhou Mountain fortress, it would only end in failure.