Lu Yin placed the Years Withered Wood on the upper screen and began frantically smashing Star Energy Marrow.
Although he had no idea what use the oldest Years Withered Wood left behind by Ku Zu might have, that didn't stop him from looking forward to finding out. Ku Zu was one of the Nine Mountains Eight Seas, a ruthless man who dared to charge into the Eternal Clan alone.
The quieter someone was, the more ruthless they tended to be.
The Years Withered Wood could be upgraded, but the cost was staggering. Its first upgrade alone consumed six billion cubic meters of Star Energy Marrow.
That was understandable. The Ku Family had said that this piece of Years Withered Wood was the closest to the one Ku Zu had left behind, and the oldest one in existence. It could withstand attacks with a million combat power.
If it could withstand attacks with a million combat power, then such a high cost made sense.
Without hesitation, Lu Yin upgraded it again. This time, it consumed ten billion cubic meters of Star Energy Marrow.
The Years Withered Wood had changed somewhat. The space around it twisted, and it seemed faintly blurred. Lu Yin had no idea what level of attack it could withstand now, or whether it had gained any other effects.
He had planned to upgrade it once more, but after thinking it over, he gave up. If he upgraded it again, he wouldn't be able to upgrade anything else.
Next was the Nether River.
What he lacked most right now were offensive treasures. He already had the medicinal hide and the Years Withered Wood for defense, while the Nether River was useful for escape.
Lu Yin looked at the Nether River. It was only a small stream a few meters