The man in the coffin, please give me some advice

The surface of the crimson coffin bore traces of time.
A dull and oppressive atmosphere emanated from inside the coffin.
The void around him became distorted, as if it was entangled by chaotic laws, which was extremely abnormal.
"What's this?"
Everyone's eyes fell on the coffin, with great fear and trepidation.
"coffin?"
A group of powerful Mahayana masters at the peak of their powers showed expressions of surprise and uneasiness, just like ordinary people.
"Grandmaster!"
The...