Final Training Ground

The Final Training Ground (て, Saihate Shugyōba; Viz: Legendary Remote Training Ground) is a derelict cave that serves as the final destination for an individual who has attained supreme power to seek further power.

In the original webcomic, this place was depicted as a temple rather than a cave.

Overview
After getting rejected by multiple dojos due to the false image of his invincible power, King is instructed by one of the masters of a dojo to seek the Final Training Ground to attain the power he wants. However, upon arrival, King only finds a man who has meditated so long that he now looks like a mummy. King panics and retreats from the place, only to run into a mysterious silhouette that he mistakes for a bear.