Zi Xu had reached level six peak immortal artifact. It was almost like half a level seven immortal artifact. Ye Mo believed if he was a top grade forgery grand master then Zi Xu would definitely become a level seven immortal artifact.
After putting away Zi Xu, Ye Mo gave up the thought of using Sky Mobility Gold to upgrade Blue Moon. Zi Xu was only level six peak meaning that his forgery skills lacked a bit.
Since he wasn't immortal forgery grand master, he didn't need to upgrade Blue Moon and waste material. Blue Moon was equivalent to level six flying immortal artifact, if he can't bring it to level seven it was pointless.
