"Immortal Emperor!"
Upon hearing Taiyi's title, Jiang Chen's gaze was quite playful.
Is Taiyi qualified to become an Immortal Emperor? You could say he is, but also that he's not.
In the Prehistoric World, considering the mistakes Taiyi has made, he definitely isn't qualified to become an Immortal Emperor. Or rather, for any rank related to heaven and earth, he's not qualified to obtain it.
Unfortunately, this isn't the Prehistoric World, but the Immortal World that Taiyi and others have established themselves. So, not to mention calling himself Immortal Emperor, even if he called himself Tiandi, it wouldn't be a problem.
Anyway, whatever title he adopts, the Heavenly Dao won't recognize it.
Right now, Taiyi and the others are essentially creating their own little circle to entertain themselves. Since it's their own circle, naturally, they can do whatever they please.
As for whether outsiders can intervene, that depends on Jiang Chen's mood.
