The things in the Immortal Mansion are much stronger than the outside world, and that is a matter of course.

The reason that caused the people of Izumo Town to be strong was the Vajra fluctuation that existed in Izumo Town, and this Vajra fluctuation was one of the treasures of the Tianhui Temple.

Of course, if you want Vajra to increase your physical strength and leave, you must get enough marble to pay for it in Izumo Town.