C3480 Threats
And that's based on his luck, and if he's unlucky, he might not be able to come back.
As for the one hundred poison devils, they would definitely alert the Skydragon World. At that time, they would be heavily guarded, and it would be hard to say how many of them would come back.
Besides the secret realm, the outside world was too dangerous.
If it wasn't necessary, mo Er didn't want to go out