"Master, it will take about 40 years to upgrade the Blood-Drinking Knife to the Extreme Dao Tool. You have to be patient."

"Forty years?" He Wuhen frowned and hurried into the fantasy of time in the Tower of the Sky.

The Blood-Drinking Knife and five upgraded materials are wrapped in silver starlight and suspended in mid-air.

"I have been here forty years, and only about five months have passed outside. This is not a long time, so I will use Xuanyuan Sword during this period."

He Wuhen weighed the pros and cons, then left the Tower of Tongtian and returned to the ancient altar.

The system doll said seriously: "The Blood-Drinking Knife begins to upgrade!"

He Wuhen saw a mysterious purple fire emanating from the Blood-Drinking Knife, wrapping many materials into a huge purple light ball.

There was chaos in the light ball, and the appearance of the blood-drinking knife or material could not be seen clearly, and only the endless purple fire was surging.

"Okay, let the Blood Drinking Knife upgrade itself."

"Doll, please explain to me what the patterns and words on this wall mean."

The doll was silent for a while before explaining solemnly.

"Master, you guessed it well. These patterns and words are indeed fonts of the Eternal Royal Family. This altar is used by the Eternal Royal Family to worship the way of heaven. The patterns and murals on the surrounding walls are also related to worshiping the heaven."

He Wuhen immediately became interested and said with anticipation: "Eternal Royal Family? Sacrifice to the sky? Dolls, what other important information is there?"

"Eternal, Heavenly Way, Heaven?" The doll scanned the words on the wall and suddenly said in surprise: "Master, this altar is the key to the eternal royal family's sacrifice to the heavenly way. They have eternal heaven. After sacrificing to the heavenly way, they can obtain the supreme way!"
Chapter completed!