It is a Mortal Cultivation Technique.
This martial arts style was very peculiar. When it reached a high enough level, its strength would become truly astounding. It was said that those who reached the ninth layer had bodies as tough as gemstones. They were impervious to all weapons, even fire and water! Even palms strike, fist techniques, and legendary swords and sabers wouldn’t be able to injure them.
But what made people most envious was that after cultivating this branch of martial art, practitioners would gain the tremendous strength of an elephant. After reaching a high enough level, their strength would be limitless. They were capable of catching live wolves and ripping tigers apart, as well as other unparalleled feats.