C1673 I will also Upgrade Nethersky Sword

He had amassed a wealth of materials from the Blue Blood Sky.

Even after promoting the Nine Yang Illusory Sun and the Starry Oceanic Pen, there was still a surplus sufficient for Xiaoyou's advancement.

Regrettably, the enhancement feature was currently capped at level 2; otherwise, he might have been able to boost Xiaoyou's strength once more