After entering, he would find the Evil God's main body and kill it. That would be the best choice.
Law forbidden grounds were naturally dominated by law stones. These law stones could assist immortal cultivators in comprehending deep-level laws and speeding up their comprehension of laws. Under the circumstances of having energy, they could speed up their cultivation.
The danger of the law forbidden land came from some law life forms. These law life forms were extremely aggressive and would attack all other life forms that stepped into the law land.
Moreover, every life form of law was extremely powerful. Immortal cultivators of the same level might not be able to defeat a life form of law.
In comparison, the source beasts of the Origin Sea were very friendly.
Those source beasts only guarded their own resources and would not take the initiative to attack the Immortal cultivators.