Even if a powerful person who imposed restrictions died, the restrictions would continue to operate and change on their own.
It could be said that the various changes in restrictions, apart from the one who imposed them, very few people could thoroughly understand a restriction.
To break a restriction, there are only two methods. One is to break it forcefully, but that requires extremely strong power, at least two levels above the person who imposed it.
For example, if a restriction was set by a strong early-stage deity, it would require at least a late-stage deity or above to have a chance to forcefully break it, and it would still take time to grind through.
The other method was to study and understand the rules and principles of a restriction to a certain extent, which could naturally lead to its decryption.
Compared to the first method, this was a more time-consuming process.
Lin Feng used the second method.