Iron Skin Realm.
Skin as tough as iron, a strength of three thousand jin in one arm.
Having reached this Realm, one was only a step away from the Bone Forging Realm.
Even prominent families with Martial Artists of the Bone Forging Realm wouldn't dare to casually underestimate those in the Iron Skin Realm.
In some martial arts schools, if a Disciple broke through to the Iron Skin Realm, they would be truly valued by the head of the school, taken as a Disciple to inherit their mantle, and might even inherit the school itself after a hundred years.
Such things had indeed happened before.
Jiang Shu stood in the small courtyard, his gaze sweeping the surroundings before finally settling on a stone, about half the size of a fist, wrapped in a piece of paper.
The stone lay under a tree, with a few fallen leaves scattered on top of it.
This was enough to prove that the paper-wrapped stone had been thrown in some time ago.
He walked over and picked it up.
