Abolish the Ancestral Teaching and Open Up the Ancestral Land 

Before the endless years, the Yun clan served the owner of the Fallen God Bow. Back then, before their master entered the Ancient Forbidden Area, he had passed down the ancestral teaching with the instruction that the Yun clan must not set one foot in the ancestral land. They were to guard it for generations to come. At the same time, they were not allowed to leave the village and they would have to perform a blood sacrifice every 10 years, also known as the Blood Sacrifice Day. 

"Blood Sacrifice Day? What happens on that day?" asked Yang Jing with a confused expression.

"All clansmen would need to pour their own blood onto the ancestral land on that day. Our blood contains some of the Overlord's power, and because of this power, we can easily control the Fallen God Bow," replied Yun Xiaolong. 

"I see." Yang Jing glanced at the fiery red wings on Yun Xiaolong's forehead with a thoughtful expression.