C507 Immortal's Arm

During his first year of seclusion, Ling Dan managed to comprehend 120 marks of Saint Force. In the fifth year, he comprehended one hundred and fifty prints of Saint Force.

In the tenth year of his seclusion, Ling Dan had comprehended two hundred marks of Saint Force.

In the twenty years of seclusion, Ling Dan broke through to the 300-mark Saint Force